while devoting their benevolence，a person may get a payback much more than the expense。这句话是不是有问题？
这是外教给我改的，原本用的都是第三人称，外教的解释是，要兼顾男女，所以要用their
但这句话前后人称不一致，不知是不是外语中的习惯用法？
正式写作中，可将 a person 换成 people。或可改换句式如下：
Those who devote their benevolence may get payback much more than the expense.
或可更简洁：(dedication 包含付出努力、代价之意）
Dedication to benevolence would be rewarded generously.
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