弓形的眉毛能拉长脸型，使脸看起来更瘦。
Arched brows help lift the face and make your face look slimmer.
虹是弓形的。
试验结果表明，螺旋折流板阻力只有弓形的30%，此外，在同样的压降下，螺旋折流板传热效率也提高10%。
Test results show the resistance of spiral plate is 30% of that of segmental baffle, and the heat transfer efficiency is improved by 10% at the same pressure.
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