Conservationists say longline gear also damages corals and other important habitat on the sea bottom, threatening both the turtles and the fish.

环保人士称延绳钓也破坏了海底的珊瑚和对其它动植物来说很重要的海底栖息地，对鱼类和海龟都造成威胁。

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In the force of forward currents, the blade rotates, and makes the gyratory shaker rotate by change gear, the gyratory shaker always keeps slight contact with the bottom of the sea;

在正向潮流作用下，叶片旋转，通过变向齿轮带动旋转搅沙器转动，旋转搅沙器与海底之间始终保持轻微接触的状态；

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This equipment is comprised of a jacketed cylinder with ellipsoidal head and tapered bottom, three-blade propeller, gear motor, etc.

本设备由附夹套的椭圆封头、锥形底的圆筒体、三叶搅拌浆、减速电动机等组成。

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Among the new measures proposed are the phasing out of bottom trawls, the heavy gear that scrapes material from the bottom of the sea - fish, coral and anything else in its way.

BBC: Fishing's global footprint

On the back wheel: the small sprocket is top gear, the large sprocket is bottom.

BBC: Sport

So the bottom-fishers are out in force -- checking their gear, if not yet actually casting.

FORBES: Here come the bottom-fishers