track drill
... track digger 履带式发掘机 track drill 铁轨钻 track driving wheel 履带驱动轮 ...
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钢板钻，铁轨钻，木工钻。
Annular cutters, Rail cutters, Auger bits.
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当工人们对排放整齐的铁轨进行最后的修整时，刺耳的钻动声和锤子的当啷生淹没了虫子的鸣叫。
The drone of insects is interrupted by a high-pitched drill and the clang of hammers as workers put the finishing touches to the perfectly aligned steel tracks.
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