夹上书签或者贴上便利贴以作标记，这样你写作的时候就能找到所需信息。
Use flags or sticky notes to mark them so you're able to find the necessary information when you're writing.
所有动物都有这个基因；这种基因有它的变体，但变体不多，因此可以作为可靠的标记。
All animals have it. It seems to vary enough, but not too much, to act as a reliable marker.
这种基因有它的变体，但变体不多，因此可以作为可靠的标记。
It seems to vary enough, but not too much, to act as a reliable marker.
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