Behind the wall, Michael pulls the toilet back into position, covering their tracks.

Michael进到墙后，将马桶拉回原位，掩盖他们的踪迹。

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They advance by covering their own tracks.

他们总是自己找辙前进。

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Artful burglars in Saudi Arabia have adopted an effective method of covering their tracks when raiding expatriate flats.

ECONOMIST: Arabian punishment: Preserving values | The

Facing a new threat of separation, Mrs Gould took off with the children again, this time fleeing to Spain, covering their tracks.

BBC: News | UK | Abduction battles are no child's play

But the two men had been extremely careful about covering their tracks.

WSJ: U.S. Rolled Dice in bin Laden Raid