“double-acting hammer”的概念、定义、翻译、参考文献-科学参考

单词	double-acting hammer
释义	double-acting hammer [¦dǝb·ǝl ¦ak·tiŋ `ham·ǝr] ^METALLURGY A forging hammer in which the ram is raised and forced down by a charge of air or steam.
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