serial number
[英][ˈsiəriəl ˈnʌmbə][美][ˈsɪriəl ˈnʌmbɚ]
n.序号，序列号，轴号;
复数：serial numbers
例句:
1.
Note that once a serial number has been observed, it is no longer in the pool and will notbe observed again.
注意到某编号被观察到一次之后，它就不会被再次观察到并计算到总数当中
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