Backcasts
回测
🗣️ 情景例句
Genetically modified foods and green foods are different.
经基因改良的食物与绿色食物是不同的。
I will be going to school in September.
我将在九月份上学。
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
大家都知道，在墙壁或山腰附近发出的喊声，就会听到回声。