a window air conditioner的用法和样例：
- Our window air conditioner is broken, so my father has decided to replace it with a separate hanging air conditioner.
- Air conditioner is not as costly as they thought a few years ago.
- Please open a window to allow the air to circulate.
- This new style of air conditioner is noiseless.
- Design and experimental study on cross-flow fan for window air conditioner