Vicissitudinary
a. 交替的,轮流的
🗣️ 情景例句
You got it!
给你啦！
John is really scared of airplanes.
约翰真的很怕乘坐飞机。
but each year, the dogs are still sent out into the snow whenever a traveller is in difficulty.
但每年还要派狗到雪山地里去帮助那些遇到困难的旅游者，