arm hammer
臂锤
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A hammer was as long as his arm.
有一个锤和他的手臂一样长。
youdao
Hammer: at the end of the arm rotation, have your wrist relaxed and on a hinge so that the hand can follow through as though it is wielding a hammer.
榔头：在肩部旋转结束时，手腕放松，如铰链连接，好像手正在挥舞榔头。
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