and what is pest or non pest
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送交者: kma 于 2012-07-27, 12:54:02:
回答: 你能不能够说坏人? 由 cornbug 于 2012-07-27, 12:36:41:
it's very complex, a pest here might be neutral or even good to human beings in another place. our knowledge on this is ever changing
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