圆盘和数根牵引钢绳构成绳轮副，伺服电机的输出轴与圆盘固定。
The cord-pulley pair consists of a disc and several pieces of traction steel cord, and the disc is fixed onto the output shaft of the servo motor.
医生：太好了。你应该镶一副固定假牙。
Doctor: Good. You should have a bridge to replace that missing tooth.
地板是红砖铺的，已经踩得很旧，宽大的壁炉里，燃着木柴，两副很可爱的炉边，深深固定在墙里，冷风绝不会倒刮进来。
The floor was well-worn red brick, and on the wide hearth burnt a fire of logs, between two attractive chimney-corners tucked away in the wall, well out of any suspicion of draught.
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