She injured her spine in a fall and a doctor told her to lie flat on her back for a month so it can mend.

她摔伤了脊椎，医生让她平躺一个月以便恢复。

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Then, after I finally got back on the motorway, I developed a flat.

后来，等我终于回到公路上时，我有一个轮胎瘪了。

《柯林斯英汉双解大词典》

She's been flat on her back for over a week now.

她卧病有一个多星期了。

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And then at the end of the process I have another whole step from B-flat back to C, and that gets me back to my octave in that fashion.

最后一步,从降B回到C是一个全音级,然后完成了整个八度

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The photo shows the plane of the Milky Way, which is often described as looking like two fried eggs back-to-back, with a flat disk in the middle.

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