他们发挥了很大的作用，在检查，保养和维修海底设施，并形成了一个先决条件，定位和建设海上单位。

They have played a significant role in inspecting, maintaining and repairing sub-sea installations and have formed a pre-requisite for locating and constructing offshore units.

youdao

他们发挥了很大的作用，在检查，保养和维修海底设施，并形成了一个先决条件，定位和建设海上单位。

They have played a significant role in inspecting, maintaining and repairing sub-sea installations and have formed a pre-requisite for locating and constructing offshore units.

youdao