trawl
/trɔ:l; trɔl/ n
1 (also `trawl-net) large net with a wide opening, dragged along the bottom of the sea by a boat （渔船用的）拖网.
2 (also `trawl line, `setline) (US) long fishing line, used at sea, to which many short lines with hooks are attached （海上捕鱼用的）排钩. trawl, v
1
(a) [I, Ipr] ~ (for sth) fish with a trawl 用拖网或排钩捕鱼.
(b) [Tn] fish (an area of water) in this way 在（某水域）用拖网或排钩捕鱼.
2 [Ipr, Tn]~ (through) sth (for sth) (fig 比喻) search through (records, etc) 查阅（档案等）
The police are trawling (through) their files for similar cases. 警方正在查阅类似案件的档案.