valve of colon

例句：

1. 1. The valve of theengine is responsible for controlling airflow.
   发动机的阀门负责控制空气流量。
2. 2. The valveof the pipeline was damaged during the construction.
   管道的阀门在施工过程中损坏了。
3. 3.The valve of the valve is essential formaintaining proper pressure in the system.
   阀门的阀瓣对于保持系统内适当的压力至关重要。