- 交替;更迭,轮流(或交替)地做;交替发生;一时…一时…;间隔着穿插 (between,with):Day alternates with night. 昼夜交替。 She alternated between hope and despair. 她时而充满希望,时而绝望。 Good times alternate with bad. 走好运与倒霉交替发生。 
- 依次;轮流:Helen and her sister will alternate in setting the table. 海伦和她妹妹将轮流摆餐具准备开饭。 My younger sister and I alternated in doing the dishes. 我妹妹和我轮流洗盘碟。 
- 定期地交换位置;经常更换住所:She alternated between New York,Chicago and San Francisco. 她经常在纽约、芝加哥和旧金山轮流居住。 
- 【戏剧】(为其他演员)作替角(for):The star actor was ill, so his understudy had to alternate for him. 这位明星演员病了,因而他的替角必须代他演出。 
- 【语言学】(作为异体与另一形式)交替出现
- 【电学】(电流)交流;作交流电运转:Diodes are electronic devices which rectify alternating current to direct current. 二极管是将交流电整流成直流电的电子装置。