通商航行的英文：
commercial shipping

commercial是什么意思：
adj. 商业的；商业性的
n. 商业广告

Commercial invoice is a document.
商业发票是一种单证。

We are not a commercial organization.
我们是一个非营利团体。

The play was a commercial success.
这出戏从营利角度看， 很成功。

There is a commercial radio station in the city.
在这个城市里有一个商业之声。

This is the government procurement not commercial.
这是政府采购，不是商业采购。

shipping是什么意思：
n. 船舶；航运（业）

The ship docked.
船靠码头了。

the belly of a ship.
轮船内部

Their ship was grounded.
他们的船搁浅了。

They ballasted the ship.
他们给船只装压舱物。

The captain of the ship has deserted the ship for survival.
船长已弃船逃生。