n.【口】[C]

1. 潜水艇
2. 候补人员；代用品
   Liverpool brought on their sub at half-time.

   利物浦队在中场休息后让候补队员上场比赛。

3. 订购
4. 副官；部下
5. 地道；地铁

vi.

1. 作替身，替代[（+for）]

a.

1. 潜艇的，水下的
2. 代替的，代用的
3. 下级的；从属的

n.

1. a submarine.
2. Brit. a subscription.
3. a substitute, especially in a sporting team.
4. Brit. a subeditor.
5. Brit. an advance or loan against expected income.

v.

1. substitute.
2. Brit. lend or advance a sum to.
3. Brit. subedit.