We should have double-checked to make sure that he was really asleep before leaving.

我们离开前应该再次确认他是否真的睡着了。

youdao

After lunch, we climbed into harnesses and helmets, all carefully checked and double-checked by our guides, and nervously awaited our turn to launch.

午餐后，我们钻进套索与安全帽中，每样装备都由导游仔细审慎地再三检查，然后我们就紧张地排队等待，准备跳跃。

youdao

It would be nice if we were right." "You double-checked your sources?"

VOA: special.2009.04.20