你别拦着我！

Nǐ bié lánzhe wǒ!

Don’t stop me!

警察把我拦下了。

Jǐngchá bǎ wǒ lánxià le.

The police stopped me.

他在海关检查处被拦下，因为他带了刀。

Tā zài hǎiguān jiǎnchá chù bèi lánxià, yīnwèi tā dài le dāo.

He was stopped at the customs checkpoint because he was carrying a knife.