“double headings”的概念、定义、翻译、参考文献-科学参考

单词	double headings
释义	double headings [¦dǝb·ǝl `hed·iŋz] ^{MINING ENGINEERING} A pair of coal headings driven parallel to each other and positioned side by side about 10-20 yards (9-18 meters) apart.
随便看	local ring local second selector local side local sidereal noon local sidereal time local solution local standard of rest local star cloud local star system local storage local storm local structural discontinuity Local Supercluster local time local trunk local variable local vertical local winds locant locate located vector locate mode locating locating hole locating surface

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