1. 指“軍隊”，既指“軍隊”的'總稱，也側重指“陸軍”。比較：navy 海軍 / air force 空軍
2. 用作主語，謂語動詞用單數 或複數 均可：
The army was [were] wiped out. 這支軍隊被消滅了。
3. “參軍”及相關說法有兩類，請注意區別：
join the army / go into the army / become a soldier / enter the army：它們均爲終止性動詞，不能與一段時間連用。
be in the army / be a soldier：均說明狀態，可與一段時間連用。
他參軍10年了。
正：He joined [went into] the army ten years ago.
正：He has been in the army for ten years.
正：He has been a soldier for ten years.
誤：He joined [went into] the army for ten years.
