畅通无阻

tā men yòng jì suàn jī kòng zhì shǐ jiāo tōng chàng tōng wú zǔ

他们用计算机控制，使交通畅通无阻。

They use computers to keep the traffic running smoothly.

jǐng chá fēng suǒ le jiē dào yǐ biàn zǒng tǒng chàng tōng wú zǔ de qū chē chuān guo chéng shì

警察封锁了街道，以便总统畅通无阻地驱车穿过城市。

The police have closed off the streets so that the president can drive through the city free of traffic.