hard-tube modulator

例句：

1. 1.The hard-tube modulator was used to adjust the temperature of the liquid.
   硬管调制器用于调整液体的温度。
2. 2.The engineer used the hard-tube modulator to control the flow rate of the gas.
   工程师使用硬管调制器来控制气体的流量。
3. 3.The hard-tube modulator was a crucial component in the manufacturing process.
   硬管调制器是生产过程中一个至关重要的组件。