如果你善于记忆喜欢背诵东西，那么柯林斯词典是你的不二选择。
比如它这样解释天空:
The sky is the space around the earth which you can see when you stand outside and look upwards.
The sun is already high in the sky.
...warm sunshine and clear blue skies...
The night sky was lit up by flashes of light. 发自小木虫Android客户端
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