injection
/ˌɪnˈʤɛkʃən/
the forceful insertion of a substance under pressure
中文释义：注射；注入
The patient received a flu injection at the clinic yesterday.
病人昨天在诊所打了流感疫苗。
Fuel injection systems improve engine efficiency and reduce emissions.
燃油喷射系统提高了发动机效率并减少了排放。