C2 the act of putting a liquid, especially a drug, into a person's body using a needle and a syringe (= small tube)注射
More examples
My arm was very tender after the injection.
If I'm talking a bit funnily it's because I've just had an injection in my mouth.
Most patients find that the numbness from the injection wears off after about an hour.
We took our cat to the vet's for its annual cat flu injection.
The injection provides some temporary relief from the pain.
C2 the introduction of something new that is necessary or helpful to a situation or process投入;增添;引入,带来
noun¹
noun²
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