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。
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。
Thee police are trawling through their files for similar cases.
警方正在档案中查阅类似案件。
Thee police are trawling through their files for similar cases.
警方正在档案中查阅类似案件。
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