“timber mat”的概念、定义、翻译、参考文献-科学参考

单词	timber mat
释义	timber mat [`tim·bǝr `mat] ^{MINING ENGINEERING} Broken timber forming the roof of an ore deposit that is being extracted by a caving method, such as top slicing.
随便看	uropod uroporphyrin Uropygi uropygial gland urostyle Urostylidae urotropin Ursa Major Ursa Major cluster Ursa Minor Ursa Minor system Ursidae ursids ursolic acid urstromthal Urticaceae Urticales urticaria Urysohn lemma Urysohn theorem usable usable iron ore usable life usable rate of fire U Sagittae

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