名词滑轮
1. 链轮：扳手操作 wrench operated | 链轮 chain wheel | 手轮 hand wheel
2. 滑轮：chain up 锁住 | chain wheel 滑轮 | chain 链
3. 链条轮：花盘连杆 free-wheel adaptor | 链条轮 chain wheel | 链轮 sprocket
4. 持链轮：chain wheel type skylight control gear 链轮式天窗传动装置 | chain wheel 持链轮 | chain wheel 链轮