Silk is also used for the safety lines many spiders drag behind them, which save them if they fall.

蛛丝也是许多蜘蛛拖在身后的安全索，能在它们跌落时保住小命。

youdao

One method:Drag a shipment underwater behind a fishing boat.

FORBES: Magazine Article

Microsoft may not have a great many friends these days, but it does drag a long value chain behind it.

ECONOMIST: Dealing with Microsoft

This is kind of a shadow recession, its effects lagging behind the first and putting a drag on the recovery.

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