change one's countenance

例句：

1. 1. The weather has changed dramatically since last week.
   自从上周以来，天气发生了巨大的变化。
2. 2. The company plans to change its marketing strategy.
   该公司计划改变其营销策略。
3. 3.The artist decided to change the painting's colors.
   艺术家决定改变这幅画的颜色。