The ship was underwater when they reached her.

他们赶到那艘船时, 船已沉到里了。

A four-joint flexible underwater pisciform propulsion system is developed and the control flow chart is presented.

计了四关节柔性鱼形推进器，给出了控制流程图，建立了运动学方程。

The undulatory biomimetic propulsor is a new underwater propulsor which emulates the swimming mode of Gymnarchus Niloticus.

摘要波动推进器是以“尼罗河魔鬼”为象计的新型推进装置。

Still, she swam the lastfew meters underwater and surfaced in the shadows of a cutbank beforeturning and looking back.

尽管如此，她还是潜过了最后几米，一处堤岸突出部的阴影露出头来，这才转身看向来路。

BENJI AT MARINELAND follows the emotive pup underwater as he communes with barracudas, dolphins, fish, and assorted other sea friends.

本片带你一睹这只感情丰富的小狗如何和梭鱼、海豚、动物和其他海洋动物朋友“交流谈心”的。

Dahn line From a surface buoy a vertical drop line is positioned alongside underwater pinnacles in depths to 2,500 m.

延绳钓法将主钓鱼线绑上无线电鱼标(浮筒),并主(干)绳以一定间距布放带鱼钩之子绳。