1. 伙伴，朋友(尤指男性之间)
    You can refer to someone's friends as their mates, especially when you are talking about a man and his male friends.

    e.g. He's off drinking with his mates...
           他跟哥儿们出去喝酒了。
    e.g. A mate of mine used to play soccer for Liverpool.
           我的一个朋友在利物浦队踢过球。

2. (用于男性之间的称呼)老兄，老弟
    Some men use mate as a way of addressing other men when they are talking to them.

    e.g. Come on mate, things aren't that bad.
           别灰心，兄弟，事情没那么糟。

3. 配偶;性伙伴
    Someone's wife, husband, or sexual partner can be referred to as their mate .

    e.g. He has found his ideal mate.
           他找到了理想的伴侣。
    e.g. ...as women do become as powerful in the marketplace as their mates.
           随着女人在商界的确变得和男人一样强大

4. (动物的)配偶，交配对象
    An animal's mate is its sexual partner.

    e.g. The males guard their mates zealously.
           雄性动物死死地守护着他们的配偶。

5. 交配;交尾
    When animals mate, a male and a female have sex in order to produce young.

mate的解释

    e.g. This allows the pair to mate properly and stops the hen staying in the nest-box...
           这样可以使这对公鸡和母鸡正常交配，让母鸡不再呆在鸡窝里。
    e.g. They want the males to mate with wild females...
           他们希望这些雄性动物可以和野生的雌性动物交配。

6. (商船上的)大副；（亦指）船员
    On a commercial ship, the mate or the first mate is the most important officer except for the captain. Officers of lower rank are also called mates .

mate

    e.g. ...the mate of a fishing trawler.
           拖网渔船上的大副

7. (美国海军的)军士
    In the United States Navy, a mate is a petty officer who has a particular set of skills and who assists a warrant officer.

mate在线翻译

8. (象棋中) 同 checkmate
    In chess, mate is the same as checkmate .

9. see also: cellmate;classmate;flatmate;playmate;roommate;running mate;schoolmate;shipmate;soul mate