Word: 系 (jì) to tie; to fasten; to button up

乘务员请我们系好安全带。

Chéngwùyuán qǐng wǒmen jì hǎo ānquándài.

The flight attendant asked us to fasten our seat belts.

他系上了领带。

Tā jì shang le lǐngdài.

He put on a tie.

司机应该系安全带。

Sījī yīnggāi xì ānquándài.

Drivers should wear seat belts.

她帮他系了领带，因为他不会。

Tā bāng tā xìle lǐngdài, yīnwèi tā búhuì.

She helped him tie his tie because he didn't know how to.

开车系安全带是强制的。

Kāichē xì ānquándài shì qiángzhì de.

Wearing a seat belt while driving is compulsory.

我是不会系领带的。

Wǒ shì búhuì xì lǐngdài de.

I won't be wearing a tie.

把绳子绷直，再系在树上。

Bǎ shéngzi běng zhí, zài xì zài shù shàng.

Pull the rope taut, then tie it to the tree.

没人系安全带。

Méi rén xì ānquándài.

None were wearing seat belts.

系上安全带。

Jì shang ānquándài.

Fasten your seat belts.

系上您的安全带。

Jì shang nín de ānquándài.

Fasten your seat belt.

请系好安全带。

Qǐng jì hǎo ānquándài.

Fasten your seat belt, please.

起步前请先系好安全带。

Qǐbù qián qǐng xiān xì hǎo ānquándài.

Please fasten your seat belt before pulling away.