航空运输是最安全的旅行方式之一。

Air transport is one of the safest forms of travel.

youdao

管道输送是成品油运输最经济、安全和高效的运输方式。

Transportation product oil with pipeline is the most economic, secure and effective way existed.

youdao

管道输送是成品油运输最经济、安全和高效的运输方式。

Transportation product oil with pipeline is the most economic, secure and effective way existed.

youdao