And keep the ground flat, smooth and delicate.

并且保持地面平整、光滑、细腻。

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When placed on the ground, baits should be situated on small paper cards or other flat, light-colored surfaces, or in test-tubes or vials.

诱饵放在地上时，应放在小纸卡上或其它平坦的浅色表面上，或放在试管或小瓶子里。

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People driving during a tornado are told to find low ground and lay flat,facedown, with their hands covering their head.

VOA: special.2011.04.19

It sits flat on the ground with the bottom open to the earth.

VOA: special.2010.07.13

Men lay flat on the ground. They prayed for the shelling to stop.

VOA: special.2009.11.05

The supply of gold coming out of the ground is flat or slightly down year-over-year.

FORBES: Gold's Fab Five Miners

Charles Robb, 73, and his sister Mary, 85, were found slumped inside the ground floor flat in Aberdeen city centre.

BBC: Fire engine

His body, found beside his bed just after 0210 BST by visitors to the Gloucester Street ground floor flat, was fully clothed.

BBC: Brighton CCTV image