alternate

alternate

名词 alternate:

someone who takes the place of another person

同义词：surrogate, replacement

动词 alternate:

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

同义词：jump

exchange people temporarily to fulfill certain jobs and functions

be an understudy or alternate for a role

同义词：understudy

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

同义词：interchange, tack, switch, flip, flip-flop

do something in turns

同义词：take turns

形容词 alternate:

every second one of a series- the White Queen

allowing a choice

同义词：alternative

occurring by turns; first one and then the other

同义词：alternating

of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired