“tractor drill”的概念、定义、翻译、参考文献-科学参考

单词	tractor drill
释义	tractor drill [`trak·tǝr ¦dril] ^{MECHANICAL ENGINEERING} A drill having a crawler mounting to support the feed-guide bar on an extendable arm.
随便看	black scour Black Sea black shale black shank black signal black silver black smoke black snow black spot black stem black storm blackstrap molasses black stripe black-surface enclosure black-surface field black tellurium black thread black tip blacktongue blacktop blacktop paver black transmission black vomit blackwater blackwater fever

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