spar
[spɑr]
n.
圆材，晶石;
[航]翼梁;
拳斗;
斗鸡;
vi.
（拳击练习中）不用力打;
试击;
争论，争吵;
（鸡）用脚踢斗;
例句:
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With protective gear on you can spar with a partner.
戴上护具后可以和对手练习轻拳出击。
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The mast, which was a solid spruce spar, bent like a bow, and for a moment I thought we were going to lose it.
坚固的云杉木做成的桅杆已经弯得像一把弓，那一刻我觉得它马上就要断了。
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We can be conviniently studied with reference to a crystal of calcite or Iceland spar.
我们可以很方便地以方解石或冰洲石晶体来进行研究.
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He likes to engage and spar over points of history and philosophy.
来自NEWYORKER
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But he and Perry continued to spar over the issue during the debate.
来自VOA
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Identical instruments spar and interlock, creating the kind of patterns that so captivated Morton Feldman.
来自BBC