He then keeled over and fell flat on his back.

然后他就倒下了，仰面朝天。

《柯林斯英汉双解大词典》

Sometimes we all expect our birthday to be a grand, joyous occasion and then it turns out quite flat.

有时候，我们都希望我们的生日是一个盛大、快乐的时刻，然后它变得非常平淡。

youdao

The best way I found to stop the cramp is to stand up keep your foot flat then push your ankle back and your knee forward.

我发现阻止抽筋最好的办法就是站起来，保持脚平放，然后向后推你的踝关节，向前推你的膝关节。

youdao

Then they rubbed the clothes on flat pieces of wood, squeezed out the water and hung each piece to dry.

VOA: special.2010.03.28

And then I could put a flat end here and I could put phosphorus here.

然后我把一个末端平面放在这儿,一块磷放在这儿。

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On a big up day like we had today, you would expect volume to be well, well, well above average, not just like 8% on the Nasdaq and then flat on the NYSE.

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So I think stocks could fall perhaps 10% and then remain flat for the rest of the year.

FORBES: Is A 10% Correction Imminent?

It moved through hoods, beanies and "Cat in the Hat" hats on to baseball caps first turned sideways and then with a flat brim (the polar opposite of the redneck and preppy artfully turned trend) and the current reinvented trend for "the bucket, " preferably from Louis Vuitton or Ralph Lauren.

WSJ: Tina Gaudoin on Style: The Hat Is On | The Top Winter Accessories