- There's a day shift as well.
这里也有“做日班”的居民
- Returning from hunting in the sunlight
完成白天的狩猎工作后
- these commuters rely on their loud clicks to find their way through the cave passages in total darkness.
这些住客利用它们响亮的叫声 在漆黑一片的洞穴通道内辨别方向
- They're cave swiftlets.
它们就是洞金丝燕
- Like bats they use echolocation to navigate.
和蝙蝠一样 它们也利用回声定位来导航
- We need lights to see what's going on,
我们必须有光才能看清前方的路
- but in the pitch black the swiftlets manage unerringly to locate their individual nesting sites,
但是金丝燕却能在黑暗中 准确无误地到达自己的筑巢点
来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 112 行