n.

1. 注射[C][U][（+into）]
   It's time for another injection.

   又該打針了。

2. 注射劑，注射液[C]
   The doctor prescribed three injections.

   醫生開了三支注射液的處方。

3. （人造衛星等的）射入軌道[U]
4. 引入；投入[C][U][（+into）]
   Many scholars were annoyed by his injection of politics into academic discussions.

   他把政治引進學術討論中，使很多學者感到惱火。

5. （毛細血管等的）充血[U]

n.

1. an act of injecting or being injected.
2. something that is injected.
3. short for fuel injection.