This blocks the vehicle from being accessed by another party, and shows its "in use" status by a red blinking signal on the card reader.

这就可以阻止汽车被别人开走，并且会通过读卡器闪烁红灯来显示此车处于“使用中”的状态。

youdao

Each blinking pattern is an optical signal that helps fireflies find potential mates.

每一个闪烁模式都是帮助萤火虫发现潜在配偶的光信号。

youdao

Cars faced off on a two-lane, aluminum track, with a little red light blinking to signal who won.

WSJ: Gentlemen, Start Your Little Cars: These Derbies Are for Grown-Ups

The light signal is consisted of a blinking pattern that flickers too fast for humans to see.

FORBES: Startup Targets Shoppers With LED-Based Indoor Navigation System