They had seen him trawling and therefore knew that there were fish.
他们看见他正用拖网捕鱼，因此他们知道那里有鱼。
But bottom trawling is brutal.
但在海底，拖网捕鱼是很残酷的。
They are trawling London for an agent .
他们正在伦敦搜罗一个代理人。
"Law firms are trawling their celebrity client base," he says.
“律所正拖网打捞他们的名人客户”，他说道。
Thee police are trawling through their files for similar cases.
警方正在档案中查阅类似案件。
Moreover, the industry would have to switch to expensive deep-water trawling.
同时捕鱼业也不得不采取更加昂贵的深海拖网作业。
Wind force and current can increase CPUE in the case of lower trawling speed.
在拖速不足的情况下，借助风力和海流可以提高CPUE的产量；
Wind force and current can increase CPUE in the case of lower trawling speed.
在拖速不足的情况下，借助风力和海流可以提高CPUE的产量；
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