My uncle sends me a picture. It’s a picture of a blue sky and white clouds.
我叔叔给我寄了一张照片。这是一幅蓝天白云的图画。
“I am so happy to see the blue sky!” says my uncle.
“看到蓝天，我太高兴了！”我叔叔说。
I wonder why. “Isn’t the sky always blue?”
我想知道为什么。“天空不是一直都是蓝色的吗？”
“No,” he says. “The sky in my city is often grey because there are too many cars.”
“不，”他说。“我住的城市的天空经常是灰色的，因为车太多了。”
That’s why he is so excited!
这就是他如此兴奋的原因！
