参军

He was scarcely sixteen when he joined the army.

参军时刚刚十六岁。

Five months have elapsed since he joined the army.

"自从参军以后,已经五个月了。"

"According to the law, a young man should enlist when he is 18."

根据法律规定青年年满十八岁必须参军。

He wished to join the army,but was rejected as medically unfit.

要参军,但因体检不合格而未被批准。