alternate

名词 alternate:

1. someone who takes the place of another person
   同义词：surrogate, replacement

动词 alternate:

1. go back and forth; swing back and forth between two states or conditions
   同义词：jump
2. exchange people temporarily to fulfill certain jobs and functions
3. be an understudy or alternate for a role
   同义词：understudy
4. reverse (a direction, attitude, or course of action)
   同义词：interchange, tack, switch, flip, flip-flop
5. do something in turns
   同义词：take turns

形容词 alternate:

1. every second one of a series- the White Queen
2. allowing a choice
   同义词：alternative
3. occurring by turns; first one and then the other
   同义词：alternating
4. of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired

1. She gets Saturdays off in her new job as against working alternate weekends in her last one.
   她新找的这份工作星期六放假，而原来的那份工作周末是隔周放假。
2. We alternate in doing the housework.
   我们轮流做家务。
3. Meetings are held on alternate Thursdays.
   每隔一个星期的星期四举行一次会议。
4. Sunny weather alternated with rain.
   天气晴雨相间。