directional phase changer

例句：

1. 1.The directional phase changer is used to control the temperature of a room.
   定向相变器用于控制房间的温度。
2. 2.The directional phase changer is an important component in the cooling system.
   定向相变器是冷却系统的一个重要组成部分。
3. 3. The directional phase changer can be used to regulate the flow of air in a building.
   定向相变器可以用于调节建筑物内空气的流动。