The blog also said the new iPad will have a flat back — the current iPad's back is curved — and is thinner by 0.12 inch.

这个博客还说新的iPad背面是扁平的(目前这款的背面有弧度)，而且还薄了0.12英寸。

youdao

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。

youdao

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》

One of the hands keeps a flat hand shape and it just kind of lightly moves back and forth as if it were a flickering image on a screen."

VOA: special.2011.04.13

Keep your lower spine flat against the back of the chair to maintain proper curvature.

FORBES: The 10 Best Exercises To Do At Your Desk

The bum lay flat on his back with his Mad Dog balanced on his chest.

NEWYORKER: Fiction

German Stephan Feck lost his balance on his second dive, landing flat on his back in the water.

WSJ: Menu