The rainbow appears after rain.

雨后出现彩虹。

同一单元的其他句子

• It is sunny today.今天天气晴朗。
• How is the weather?天气怎么样？
• It is raining outside.外面正在下雨。
• Put on your coat.穿上你的外套。
• Is it windy?有风吗？