solenidion

例句：

1. 2.
   某些机械装置的
2. 3.
   某些弹簧或类似物体的
3. 1. The solenoid valve is used to control the flow of oil in a hydraulic system.
   电磁阀用于控制液压系统中油的流动。
4. 2. The screwdriver has a servo motor inside, which allows it to rotate at high speeds.
   螺丝刀内部装有伺服电机，可以高速旋转。
5. 3. The spiral staircase leads up to the second floor, with each step taking you higher.
   螺旋楼梯通向二楼，每走一步就升上一层。