The medicine will not take action until two hours later.

这药在两小时后才会起作用。

youdao

Forty-eight hours later Stephen Carroll, a police constable with less than two years to go until retirement, was shot in the head when he answered a call for help in Craigavon.

48小时后，还有不到两年就退休的警员斯蒂芬·卡罗尔，在接听克雷加文区的来电时被射中头部。

youdao

I slept two hours later than usual, because I play computer games until two o 'clock.

我比平常晚睡了两个小时，因为我玩电脑游戏玩到两点。

youdao

He put a DVD on in Sonny's room for him, which happened most nights to help him fall asleep, and stayed in until another family member came home about two hours later.

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Two hours later he was back at the table, writing through the night without feeling tired, until 8:30 the next morning when he packed up his computer, showered and dressed again, and got his family ready for the trip to Nashville for the first memorial service.

CNN: Excerpt: 'The Prince of Tennessee: The Rise of Al Gore'