例句：
1、He is too young to join the army.
他太年輕了,還不能參軍。
2、When did you join the air force?
你什么時(shí)候參加的空軍部隊(duì)?
3、The regular troops of Baden joined the insurgents.
巴登的正規(guī)軍參加到起義軍方面來(lái)了。
4、John joined a football club a few days ago.
約翰幾天前加入了一個(gè)足球俱樂(lè)部。