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The bomb must explode within less than a millionth of a second.
那枚炸弹必须在百万分之一秒内爆炸。
《柯林斯英汉双解大词典》
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A microsecond is a millionth of a second.
1微秒就是一百万分之一秒。
youdao
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The atomic clock is accurate to one millionth of a second.
原子钟计时可以精确到百万分之一秒。
youdao
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The atomic clock is accurate to one millionth of a second.
原子钟计时可以精确到百万分之一秒。
youdao