三副： 永久地固定在艇上，先生。
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.
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.
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