Meaning of cān jūn:
cān jūn
参军
Verb
to join the army
Tā juédìng zài míngnián cānjūn.
他决定在明年参军。
He decided to join the army next year.
Noun
(official title in imperial China) military adviser; aide-de-camp
Tā juédìng míngnián qù cānjūn.
他决定明年去参军。
He decided to join the military next year.