That custom guide RNA molecule is like a homing beacon.
这种自定义向导RNA分子就像一个导航信标。
读者文摘选编
When you use an app involving your location, your phone constantly transmits where you are, like a homing beacon.
当你使用一个与你的位置有关的应用程序时，你的手机会不断发送你的位置信息，就像一个归航信号一样。
英语百科
Homing beacon
A homing beacon is a radio or acoustic device that allows the user to track a ship, aircraft, an animal, or another individual. Depending on the beacon, the range can be as short as a hundred metres, or, in science fiction, allow for tracking a ship through hyperspace.