water cooled exhaust manifold

例句：

1. 1. The engine uses a water-cooled exhaust manifold to cool down the exhaust gases.
   发动机使用一个水冷式排气歧管来冷却废气。
2. 2. The car's performance was greatly improved by using a water-cooled exhaust manifold.
   使用水冷式排气歧管后，汽车的性能得到了极大的提升。
3. 3. The engineer replaced the old water-cooled exhaust manifold with a new one to improve efficiency.
   工程师用一个新的水冷式排气歧管替换了旧的，以提高效率。