那枚炸弹必须在百万分之一秒内爆炸。
The bomb must explode within less than a millionth of a second.
为促成一次核爆炸，临界质量必须在一百万分之一秒内聚集在一起。
In order to make a nuclear explosion, the critical mass must come together within a fraction of a millionth of a second.
1微秒就是一百万分之一秒。
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