fēi / jī / yè / háng / shí / xū / yào / dǎ / kāi / háng / xíng / dēng / yǐ / què / bǎo / ān / quán

飞机夜航时需要打开航行灯以确保安全。

When an airplane flies at night, it needs to turn on navigation lights to ensure safety.