比如不能择枝而栖，甚至连在草丛安家也成奢望的飞禽，只能在鼠洞里屈就，而其宿费就是在寒冬时节必须衔枝而归，这种鸟鼠同穴的景象只有在世界屋脊才能随处可见。

For instance, the birds who have no tree branches, or even plants, in which to make a nest have to compromise and to take shelter in rat holes, for which they must find some branches in winter time.

youdao

比如不能择枝而栖，甚至连在草丛安家也成奢望的飞禽，只能在鼠洞里屈就，而其宿费就是在寒冬时节必须衔枝而归，这种鸟鼠同穴的景象只有在世界屋脊才能随处可见。

For instance, the birds who have no tree branches, or even plants, in which to make a nest have to compromise and to take shelter in rat holes, for which they must find some branches in winter time.

youdao