priming plug hole

例句：

1. 1. The engine needs to be primedbefore it can start.
   发动机需要先进行预燃才能启动。
2. 2. The mechanic replaced thepriming plug hole with a new one.
   机械师用一个新的替换了原来的点火塞孔。
3. 3. The car's performance was improvedafter the priming plug hole wasreplaced.
   更换了点火塞孔后，汽车的性能得到了提升。