They can detect ultrasound; this means that when a bat approaches, the moth can detect the bat's presence.
它们可以探测到超声波；这意味着当蝙蝠靠近，飞蛾可以察觉到它的存在。
2
Unfortunately, this means that disk utilities cannot properly detect the presence of such disks.
遗憾的是，这表示磁盘工具不能合理检测这种磁盘的存在。
3
It can detect the presence of people on the other side of a barrier by distortions to the reflected radio waves caused by their breathing or heartbeat.