可能发生某种反应的临界值也许不到可能致命剂量的千分之一，那么，你在哪里划这条线呢？

The threshold level at which some kind of reaction can occur may be less than a thousandth of a potentially fatal dose, so where do you draw the line?

youdao

可能发生某种反应的临界值也许不到可能致命剂量的千分之一，那么，你在哪里划这条线呢？

The threshold level at which some kind of reaction can occur may be less than a thousandth of a potentially fatal dose, so where do you draw the line?

youdao