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每周一听——那些年我们一起练过的听力(第51期) 已有55人参与
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83楼2013-03-09 08:09:45
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求知者001: 回帖置顶 2013-03-02 13:13:45
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感谢大家支持,上期活动链接:http://muchong.com/bbs/viewthread.php?tid=5529056&fpage=1 上期活动讲解 词汇讲解: 1. lack vt. 缺乏; 缺少 例句:I lack words with which to express my thanks. 我无法以言语来表达我的感激之情。 2. either adv. (否定句中)也 例句:The product is of high quality and is not expensive either. 这种产品质量好价格也不贵。 3. undesirable adj. 令人不快的,不受欢迎的;讨厌的 例句:Big cuts in education are very undesirable. 教育经费的大幅度削减是极不受欢迎的。 4. outweigh vt. 在重要性或价值方面超过 例句:Her need to save money outweighs her desire to spend it on fun. 她省钱的需要比她花钱娱乐的愿望更重要。 5. survive vi. 幸存, 活下来 例句:These plants cannot survive in very cold conditions. 这些植物在严寒中不能存活。 6. eradicate vt. 摧毁,完全根除,消灭,杜绝 例句:The disease has been eradicated from the world. 这种疾病已在全世界得到根除。 7. dense adj. 密集的, 稠密的, 浓密的 例句:We entered a dense forest. 我们进入一片浓密的森林。 8. transport vt. 运送; 流放 例句:A bus transported us from the airport to the city. 一辆公共汽车把我们从飞机场送到城里。 9. bury vt. 掩埋, 埋藏 例句:The old man is burying his money. 老头正在埋藏他的钱。 10. graze v. (让动物)吃草; 牛、羊等(在草地上)吃青草 例句:The cattle are grazing in the field. 牛群在田野上吃草。 短语讲解: 1. Weeds compete with plantings for water and nutrients. compete with与…抗争 例句:It is difficult for a small grocery store to compete with a supermarket. 小商店很难与超市抗争。 2. A crop plant generally produces several hundred seeds. But a weed plant can produce tens or even hundreds of thousands of seeds. hundreds of thousands of 几十万,无数,成千上万的 例句:The city subway carries hundreds of thousands of passenger a day. 市内的地下铁每天运载数十万乘客。 3. Eradicating weeds means that you have to remove all the seeds and roots so the plants will not grow back. grow back重新长出 例句:All her hair was burned off in the fire, but the doctors have promised that it will soon grow back. 她的头发在大火中烧掉了, 但医生保证她的头发还会长起来的。 4. A more common way to deal with weeds is to control them enough so that the land can be used for planting. deal with应付, 处理; 对待 例句:There are many difficulties to be dealt with when starting a new business. 开展一项新业务时, 有许多困难需要解决。 be used for用来做… 例句:Wood is used for making paper. 木材用于造纸。 5. He says a dense, competitive crop that quickly shades the soil from the sun will help reduce weed growth. shade from挡, 遮(光或热) 例句:She raised her hand to shade her eyes from the sun. 她抬起手遮住眼睛上方以挡住阳光。 6. Other controls include turning over the soil, pulling the weeds or covering them with mulch made of wood, garden waste or other material. turn over (使)翻转; 调转 例句:The soil must be thoroughly turned over before planting. 一定要先把土地深翻一遍再下种。 cover with用…遮盖住, 用…填满 例句:The field is covered with snow. 田野一片积雪。 7. But even mulch has its limits. Natural resource specialists point out that weeds can be transported in mulch. point out指出 例句:He pointed out that there was little chance of success. 他指出很少有成功的机会。 8. Insects and other organisms can also act as biological controls. act as担当…; 起…的作用 例句:An oar often acts as rudder. 桨常可起舵的作用。 9. Farm vehicles should be kept out of areas with weeds. keep out (使)留在外面 例句:They shut the door and meant to keep us out. 他们关上门, 存心不让我们进去。 When is a plant considered a weed? Experts at Penn State University have a simple answer: When the undesirable qualities outweigh the good qualities. 植物在什么时候被当做杂草?宾夕法尼亚州立大学的专家们给了简单的答案,那就是当不合意的品质大于良好品质时。 Consider the fact that crops generally produce several hundred seeds from each plant. By comparison, each weed plant can produce tens or even hundreds of thousands of seeds. And some buried seeds can survive up to forty years -- or even longer. 通常情况下,农作物每株会生产几百粒种子。但是每株野草会生产几万甚至几十万粒种子。有一些深埋的种子可以存活四十年甚至更长时间。 Eradicating weeds means that you have to remove all the seeds and roots so the plants will not grow back. But birds or the wind can reintroduce them to the land. 根除野草意味着必须除掉所有的种子,并且将植株连根拔起,以免其重生。但是鸟或风会将种子重新带回土地。 A more common way to deal with weeds is to control them enough so that the land can be used for planting. Experts advise using two or more control methods to deal with weeds. 处理野草更加普遍的方法是对其加以中分的控制,使土地可以耕种。专家建议使用两种或者更多方法来处理野草。 Chemical weed killers or natural treatments like corn gluten can suppress weed growth. Dense planting of a crop can also act as a natural control. 化学杀虫剂或玉米黄粉等自然方法可抑制杂草生长,将作物种稠密些也可自然控制杂草。 Bill Curran is a professor of weed science at Penn State, in University Park, Pennsylvania. He says one of the most common methods for suppressing weeds is dense planting. Bill Curran是宾夕法尼亚州立大学大学城分校教授,他说最常见的控制杂草的办法是密植。 He says a dense, competitive crop that quickly shades the soil will help suppress many weeds. The seeds need light to grow, so blocking the sun will reduce weed growth. 他说,稠密、竞争性强的作物可以快速遮盖土壤并抑制多种杂草,种子生长需要阳光,所以封锁阳光就阻止杂草的生长。 Other controls include turning over the soil, pulling the weeds or covering them with mulch made of shredded wood, garden waste or other material. 其他控制方法包括翻土,用手拔草或者用木质地膜,花园废弃物或其他材料进行覆盖。 But even mulch has its limits. Natural resource specialists point out that weeds can be transported in mulch. This is also true of soil, grain, hay and animals. 但是覆盖物也有其局限性。自然资源专家指出,杂草可以通过地膜进行传播。也可以通过土壤,谷物,干草和动物进行传播。 Yet animals like sheep or goats eat weeds, so they can provide a biological control. Insects and other organisms can also act as biological controls. 然而,动物,比如绵羊或山羊可以起到生物控制的作用——他们会吃掉杂草。昆虫和其他有机体都可以起到生物控制的作用。 Preventing the spread of weeds is an important part of weed management. Farm vehicles should be kept out of areas with weeds. If that is not possible, then clean off the equipment and your shoes when leaving. 控制杂草的传播是杂草管理的重要部分。农田机器应该远离长满杂草的地方。如果不可能的话,离开的时候要清洁机器和鞋子。 Some people burn weeds or bury them deeply or make them into mulch. 一些人将杂草和花园废弃物带到垃圾中心或者燃烧,深埋或将他们绞碎。 Professor Curran says another way to make use of weeds is to compost them. Heat is produced in the process of making organically rich compost to improve soil. The heat will kill many, though not all, weed seeds. The same is true for seeds that pass through animals that graze on weeds. Curran教授说,用杂草制作堆制肥料是对杂草加以利用的好方法。制作有机堆肥的过程会产生热量。热量会杀死许多杂草种子。农田生物拒绝杂草的过程道理也是一样的。 |

2楼2013-03-02 13:13:36

3楼2013-03-02 13:16:01
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