2 sentences for 开启 (kāi​qǐ — activate)

1. 感应灯在有人经过时会自动开启。

   gǎn​yìng​dēng zài yǒu rén jīng​guò shí huì zì​dòng kāi​qǐ.

   The motion-sensor light turns on automatically when someone passes by.

   Source: Dong Chinese Dictionary

2. 只要用力按压这个黑色开关，机器就会自动开启。

   zhǐ​yào yòng​lì àn​yā zhè​ge hēi​sè kāi​guān, jī​qì jiù huì zì​dòng kāi​qǐ.

   Just press this black switch firmly, and the machine will start automatically.

   Source: Dong Chinese Dictionary