steering column jacket oil hole cover

例句：

1. 1. Thesteering column is the part that connectsthe steering wheel to the engine.
   转向柱是连接方向盘和引擎的部分。
2. 2. The jacket oilhole cover is used to protect the oilpassages in the engine.
   夹层油箱盖用于保护发动机内的油道。
3. 3. The oilhole cover is designed to prevent oil fromleaking out of the engine.
   油孔盖的设计目的是防止机油从发动机中泄漏。