红灯

hóng dēng liàng de shí hou nǐ jiù yīng gāi gěi diàn chí chōng diàn le

红灯亮的时候，你就应该给电池充电了。

When the red light comes on, you should recharge the battery.

xìn hào dēng xiǎn shì de shì hóng dēng

信号灯显示的是红灯。

The traffic lights were on red.

xìn hào dēng chū gù zhàng le zhǐ yǒu hóng dēng yī zhí zài shǎn

信号灯出故障了，只有红灯一直在闪。

There is something wrong with the traffic light because only the red light flashes on and off.