n.someone who takes the place of another person

同義詞：surrogatereplacement

v.

go back and forth; swing back and forth between two states or conditions

同義詞：jump

exchange people temporarily to fulfill certain jobs and functions

be an understudy or alternate for a role

同義詞：understudy

reverse (a direction, attitude, or course of action)

同義詞：interchangetackswitchflipflip-flop

do something in turns

同義詞：take turns

1. She alternated between working and resting throughout the day.
   她整天交替工作和休息。
2. The lights alternated between red and green during the test.
   在測試過程中，燈光在紅色和綠色之間交替變化。
3.