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?
首次发现在引发剂量增加而导致微球粒径增加时，在增加的趋势中存在“临界点”；③。
Secondly, A critical point was found during the particle size increasing with increasing initiator concentration for the first time.
首次发现在引发剂量增加而导致微球粒径增加时，在增加的趋势中存在“临界点”；③。
Secondly, A critical point was found during the particle size increasing with increasing initiator concentration for the first time.
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