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.

《柯林斯英汉双解大词典》

1微秒就是一百万分之一秒。

A microsecond is a millionth of a second.

youdao

原子钟计时可以精确到百万分之一秒。

The atomic clock is accurate to one millionth of a second.

youdao

原子钟计时可以精确到百万分之一秒。

The atomic clock is accurate to one millionth of a second.

youdao