1. （使）交替；（使）輪流
    When you alternate two things, you keep using one then the other. When one thing alternates with another, the first regularly occurs after the other.

    e.g. Her aggressive moods alternated with gentle or more co-operative states...
           她情緒多變，時而咄咄逼人，時而又顯得溫柔平和或樂于合作。
    e.g. The three acts will alternate as headliners throughout the tour...
           這3個節(jié)目將在整個巡回演出中輪流打頭牌。

2. 交替的；輪流的
    Alternate actions, events, or processes regularly occur after each other.

    e.g. They were streaked with alternate bands of colour.
           它們都帶有各種色彩相間的條紋。

3. 每隔一（天等）的
    If something happens on alternate days, it happens on one day, then happens on every second day after that. In the same way, something can happen in alternate weeks, years, or other periods of time.

alternate是什么意思

    e.g. Lesley had agreed to Jim going skiing in alternate years.
           萊斯莉已同意吉姆每隔一年去滑一次雪。

4. 供選擇的；備用的；其他的
    You use alternate to describe a plan, idea, or system which is different from the one already in operation and can be used instead of it.

alternate

    e.g. His group was forced to turn back and take an alternate route.
           他的小組被迫返回并選擇了另一條路線。
    e.g. ...alternate forms of medical treatment.
           其他可供選擇的醫(yī)療方案

5. 代替者；候補者
    An alternate is a person or thing that replaces another, and can act or be used instead of them.

    e.g. In most jurisdictions, twelve jurors and two alternates are chosen...
           大多數(shù)轄區(qū)都會選出12名陪審員和2名候補陪審員。
    e.g. The six food groups include grain products, vegetables, fruits, milk and milk products, meats and meat alternates, and a miscellaneous group.
           這6類食物包括谷類產品、蔬菜、水果、牛奶和奶制品、肉類和肉類替代品以及雜類食品。

6. （尤其在美國英語中，當alternative作義項3、4和5解時，代替alternative使用）
    Alternate is sometimes used, especially in American English, instead of alternative in meanings 3, 4, and 5.

    e.g. ...an alternate lifestyle.
           另一種生活方式