steepens
v.
（使）变得陡峭( steepen的第三人称单数 );
例句:
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A compression wave in decelerating flow steepens.
压缩波在减速流中变陡.
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The path steepens as you climb the hillside.
沿着山坡往上爬时,那条小径越来越陡.
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With each year that realistic implied haircut only steepens as federal finances become more hopeless.
来自WSJ