从重量为百万分之一克的样品中提取有关行星宏观组成的信息是一个极为有趣的科学尝试实例。
Extracting information about the large-scale composition of a planet from a sample weighing a millionth of a gram was a fascinating example of scientific endeavour.
假设一年内发生同等规模事故的可能性为百万分之一。
Suppose that his estimate is correct, in the sense that the probability of an accident of this magnitude in any year was one in a million.
这种钟表通过电磁波的频率来计算时间，单位为百万分之一秒。
The clock measures the passage of time in millionths of a second by counting the frequency of electromagnetic waves.
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