Sleeping, lying flat to sleep, wake up after back pain.

睡觉时，平躺着睡，醒后就腰疼。

youdao

Outer coat is straight, coarse, dense, of medium length and lying flat.

外层披毛直、粗硬、浓密、中等长度，平躺在身体上。

youdao

They picked up the bank guard who, poor fellow, was still lying flat on the floor.

他们扶起了那个银行保安，这个可怜的傢伙当时还趴在地上。

youdao

More severe heart failure causes swollen legs and the patient has difficulty breathing when lying flat.

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Lying flat on your back, for instance, may be good for the lower back but can exacerbate digestive and breathing problems and snoring.

WSJ: Find the Perfect Sleep Position

It is most easily carried out lying flat on the board.

ECONOMIST: Joseph Wolfson | The