injection

• 指用注射器将液体（如药物或疫苗）注入体内的行为；也泛指注入、添加某物的过程。

A noun referring to the act of introducing a liquid, especially a drug or vaccine, into the body using a syringe and needle.

1. Medical injectionB1formalmedical

   The act of introducing a liquid, especially a drug, into the body using a syringe and needle.

   注射

   • The nurse gave him a flu injection.
   • She received an injection of insulin for her diabetes.
   • The doctor recommended a tetanus injection after the injury.

   同义词inoculationjabneedleshot

2. Engineering injectionB2formaltechnical

   The process of forcing a liquid or gas into a cavity, chamber, or system under pressure.

   喷射

   • The fuel injection system improved the engine's efficiency.
   • Injection molding is used to produce plastic parts.
   • Water injection is used in some oil extraction processes.

   同义词infusioninsertioninstillationintroduction

3. Introduction of something newB2formal

   The act of adding or introducing something new, such as money, ideas, or energy, into a system or situation.

   注入

   • The government announced a cash injection into the economy.
   • Her speech provided an injection of enthusiasm into the team.
   • The new manager brought an injection of fresh ideas to the company.

   同义词additioninfusioninsertioninstillationintroduction

   反义词eliminationextractionremovalwithdrawal