When trawling you may catch hermit crabs .

你们用拖网捕鱼时可能会捕到寄居蟹。

They are trawling for cod .

他们正在用拖网捕鳕。

That included trawling through thousands of company e-mails .

调查包括仔细查阅数千封公司电子邮件。

Bottom trawling can target cod down to 200 meters or so .

拖网作业则可捕到200米甚至更深处的鳕鱼。

Congressmen will have to contend for the first time with good-governance groups , and with their political enemies , trawling through their investments .

国会议员们将不得不通过他们的投资进行拖网作业，首次与管理精良的团队以及他们的政敌做斗争。