Ursidae that have a shaggy coat and a short tail and walk with the entire lower surface of the foot touching the ground.

熊一种通常具危险的熊科哺乳动物，有浓密的毛发和短尾巴，行走时脚的较低表面触地。

youdao

The machining of valve bore with diamond reamer features high productivity, long service life of reamer and lower surface roughness.

采用金刚石铰刀加工阀孔，生产率高，刀具寿命长，表面粗糙度低。

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When they descend to 50 meters or deeper, they must return to the surface slowly, to allow their bodies to readjust to the lower surface pressure.

当他们潜到50米或更深之后，必须缓慢的回到水面，才能使他们的身体重新将压力调节到低一些的水面气压。

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The areas the printmaker cut away will be lower on the surface of the wood.

VOA: special.2009.09.02

Her partial prosthesis had worn through the bone on the lower surface of her knee.

NEWYORKER: Big Med

Water coming up from below will often have a lower pH than the surface water, because at depth there is no photosynthesis but plenty of respiration.

ECONOMIST: Ocean acidification

Even a relatively small amount of gas a can cause big problems because a gas bubble will expand massively as it moves from high pressure at the seafloor to lower pressure at the surface.

FORBES: BP's Deepwater Disaster: What Happened And Why?