Sie suchten nach: trolling purposes (Englisch - Chinesisch (Vereinfacht))

trolling
曳

the main gears used are longlines, pole and line, purse seines and trolling.
使用的主要渔具为延绳、竿钓、围网和曳绳。

this category also includes fish caught by trolling/hand-lining from small vessels in the open sea adjacent to the islands;
这一种类也包括：在邻近岛屿的公海上的小船上通过拖捕(手钓)捕鱼；

bottom-fishing and deep-sea trolling have already caused and continue to cause severe impacts; and prospecting constitutes another potentially significant direct threat.
海底捕捞和深海拖钓已经而且仍在造成严重影响，探矿则构成另一种可能很严重的直接威胁。

purpose
目的