- spider gear
- 差: send on an errand; dispatch
- 速: fast; rapid; quick; speedy
- 变速轮: change pulley; change speed gear; change spur gear; change wheels; change-wheel; ratio gear; stud gear; variable speed wheel gear; variable-speed wheel gear
- 测速轮: tachometer wheel
- 调速轮: change gear; fly wheel governor
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