位置固定的转位子第一次出现是在一百万年前，通过观察现在这些序列的排列顺序，科学家们就可以了解到那个时代的人口数量。

One particular transposon first appeared about a million years ago. And by seeing where these sequences now sit, scientists can get a sense of the size of the breeding population back then.

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排序序列是字符集的一种次序，确定每个字符与另一字符相比排列更高、更低或相同。

A collating sequence is an ordering for a set of characters that determines whether each character sorts higher, lower, or the same as another.

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位置固定的转位子第一次出现是在一百万年前，通过观察现在这些序列的排列顺序，科学家们就可以了解到那个时代的人口数量。

And by seeing where these sequences now sit, scientists can get a sense of the size of the breeding population back then.

youdao