External cutters are generally used to remove the topmost, possibly damaged, portion of a fish to enable an overshot, or similar fishing tools, to engage on an undamaged surface.

外割刀一般用来去除落鱼的最上面的可能被损坏的部分，以便使打捞筒或类似的打捞工具与未损坏的表面接合。

youdao

This paper describes the surface test and field application of using explosive method to dispose PDC bit fishing accident.

介绍了大庆油田利用爆炸破碎后打捞的方法，处理PDC钻头落井事故的地面试验及现场施工情况。

youdao

A downhole tool used in fishing operations to engage on the outside surface of a tube or tool.

在打捞作业中所用的一种井下工具，在打捞时它与管子或工具的外表面接合。

youdao

On May 4th 1915 its keepers, probably peering out from the elegant balcony on the seventh floor, saw a German submarine cheekily surface to buy the morning's catch from a local Irish fishing boat.

ECONOMIST: The Fastnet Lighthouse: Light on a lonely rock | The

So it ought to be possible to test for the presence of a certain antigen on a surface by dragging a suitable antibody over it, and seeing if it gets stuck going fishing, in effect, on a molecular scale.

ECONOMIST: Microscopy