"栖栖"是个多义词，它可以指栖栖（词语解释）,栖栖（漫画《龙凤呈祥》女主角）。
关于鸟类飞行的起源，传统上提出了两种对立的假设：“地栖说”和“树栖说”。
Two opposing scenarios, the "arboreal" hypothesis and the "cursorial" hypothesis, have traditionally been put forward concerning the origins of bird flight.
可以肯定的是，这些水陆两栖物种的数据出现在接近三角坐标中间的位置，位于水栖海龟和陆栖乌龟的坐标点之间。
Sure enough, these amphibious species show up on the triangular graph approximately half way between the "wet cluster" of sea turtles and the "dry cluster" of land tortoises.
报告指出，一些栖地和物种之所以被纳入栖地指令，是因为他们正面临着威胁，因而也更难保护。
The report notes that habitats and species in the habitats directive were chosen because they were under threat, and so were harder to conserve.
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