Defense lawyers claim Jackson gave himself the fatal dose after his doctor left the room.
辩护律师则说，杰克逊是在医生离开后，自己给自己使用了致命的药剂。
The fatal dose of radiation for a human is 6 sieverts.
6西弗特辐射对人类就可以致命。
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?
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？
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