基本解释[机械工程]标准蜗杆词组短语短语Involutes master worm 渐开线测量蜗杆master worm with two threads 双头测量蜗杆master worm with one thread 单头测量蜗杆master worm with three threads 三头测量蜗杆master worm更多词组专业释义机械工程标准蜗杆