The thieves had trussed the guard up with rope.

盗贼用绳子把警卫捆了起来。

youdao

Coast Guard chief warrant officer Adam Wine says the work involves using special towels to wipe up the sticky oil.

VOA: standard.2010.06.01

While clean-up continues in Louisiana,Alabama and Mississippi, officials in Florida are watching to guard against oil damage here as well.

VOA: standard.2010.07.05

She says people must keep up their guard against the virus, which is unpredictable and could change into a far more dangerous form.

VOA: standard.2009.12.29

Nonetheless, the United States will probably keep its guard up until Brazil establishes a clearer record in foreign policy.

ECONOMIST: Two American giants are slowly getting to know each other

But they have their guard up as the pressure on teachers grows.

NPR: New Evaluation Laws Split Teachers Even More

But those interested in sailing frugally need to keep their guard up.

CNN: Sail the high seas on a budget