“trench excavator”的概念、定义、翻译、参考文献-科学参考

单词	trench excavator
释义	trench excavator [`trench `ek·skǝ´vād·ǝr] ^{MECHANICAL ENGINEERING} A digging machine, usually on crawler tracks, and having either a movable wheel or a continuous chain on which buckets are mounted. Also known as bucket-ladder excavator; ditcher; trencher; trenching machine.
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