- train
- 系: system; series
- 轮系: gear train; wheel train; wheels; wheeltrain
- 系: 系动词(打结; 扣) tie; fasten; do up; button up 把晾衣服绳系在树上 fasten a clothesline between two trees; 把衣服扣子系上button up a jacket; 系围裙 wear an apron; 系鞋带 tie shoe laces
- 齿轮系: gear system; gear train; train of gearings; train of gears; train of toothed wheels; train of wheels
- 凸轮系: ct cam-train
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