Some are tethered to ships, whereas others are cast free to operate like miniature submarines, although these too need the services of a support vessel.

有一些与船只绑定，另一些则如同微型潜水艇一样自由航行，但也是需要有供给船只服务的。

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Hovering: a helicopter hovers above the Montecristo during the operation to free the vessel in the Indian ocean.

盘旋：在印度洋救援货船行动期间，一架直升机盘旋在“蒙特·克里斯托”号上空。

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The nitrogen Deoxo Vessel contains a fixed bed of free copper catalyst which removes oxygen from the nitrogen stream by oxidation of copper to copper oxides.

氮气脱氧罐中装有一个游离铜催化剂的固定床，通过将铜氧化成氧化铜把氧气从氮气中脱除。

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Nine days later, the judge Richard Adjei Frimpong dismissed a motion by the Argentine state to free the vessel on the grounds that it counted with diplomatic immunity, according to AFP.

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As many as 1, 500 residents of the northern Illinois city of Marseilles were evacuated after seven barges broke free from a towing vessel and struck a dam on the Illinois River.

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The third mistake was that, because the workers were allowed to bypass the time-consuming mixing process in the tower, with its automatic controls for preventing such things happening, they were free to dump their material into a vessel that was not designed to prevent the accumulation of a critical mass sufficient to support a chain reaction.

ECONOMIST: All over in a flash