“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	scum scum chamber scupper scupper pipe scurf S curve scurvy scutch scutching scute Scutechiniscidae Scutelleridae scutellum Scutigeromorpha scuttle scuttlebutt Scutum scutum scuzzy Scydmaenidae scyelite Scyllaridae Scyllaridea Scylliorhinidae scyphistoma

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