1、The doctor used an injector to administer the medicine.
医生用注射器给我打了针。

2、The fuel injector in my car needs to be replaced.
我车上的喷油嘴需要更换。

3、The aircraft is equipped with powerful jet engines and fuel injectors.
该飞机配备了强力的喷气发动机和喷油嘴。