Fēixíngyuán yǔ kòngzhìtǎ bǎochí liánxì.
The pilot maintains contact with the control tower.
Kòngzhìtǎ zhǐhuī fēijī ānquán jiàngluo.
The control tower directs planes to land safely.
Jīchǎng de kòngzhìtǎ quántiānhòu yùnzuò.
The airport's control tower operates around the clock.
