... harmonic series 调和级数 head of an arrow 箭头 head or tail (硬币的)正面或背面 ...
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head of an arrow
箭头
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The removal of a neutron from the system is indicated by the head of an arrow.
用箭头表示一个中子从这个系统中的移动。
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Arrow: Printing fault in gravure which appears as a mark in the shape of an arrow head on the print. Also called comet.
箭形印记：是照相凹版印刷的瑕疵。印刷品上带有像箭头的印纹。亦称慧星印记。
The search turned up traces of the building, and then something altogether more exciting: A human skeleton, complete with evidence of battle wounds -- a blow to the head, and an arrow in the back -- and scoliosis, or curvature of the spine.
CNN: Richard III: The mystery of the king and the car parking lot
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