目前，我国正在研制7000米载人深潜器，这是一个庞大的系统工程。

At the present time, the project of "7000 meters DSV" has been started in China and it is a great one.

youdao

目前，我国正在研制7000米载人深潜器，这是一个庞大的系统工程。

At the present time, the project of "7000 meters DSV" has been started in China and it is a great one.

youdao