航空公司有义务承担旅客的安全问题。

Hángkōng gōngsī yǒu yìwù chéngdān lǚkè de ānquán wèntí.

Airlines have an obligation to ensure passenger safety.

我没有义务去讨好别人。

Wǒ méiyǒu yìwù qù tǎohǎo biérén.

I have no obligation to please others.

作为公民，我们有义务遵守法律。

Zuòwéi gōngmín, wǒmen yǒu yìwù zūnshǒu fǎlǜ.

As citizens, we have an obligation to abide by the law.