老师：我们都知道热胀冷缩的道理。现在，谁给我举个例子？
约翰：嗯，在夏天天都长，在冬天天都短。
Teacher：We all know that beat causes an object to expand an cold cauese it to contract. Now，can anyone give me a good example?
John：Well ，in the summer the days are long，and in the winter the days are short.
牛和狗
一头牛和一只狗同时为一个农夫工作。
一天， 狗骄傲地说着；‘我是多么重要啊！白天我在牧场看护家群，晚上我看家。而你呢…..?”
“我？我怎么啦？“ 牛反问。
“你只会犁地或是拉扯。”狗不懈地说。
“是的。你说得没有错，”牛回答道。“但是如果没有我犁地，你看护什么呢？”
The Ox and the Dog
An ox and a dog serve for the same farmer.
One day the dog arrogantly says: “How grand I am! In the daytime, I watch out for the cattle in the meadows; at night, I guard the house. But you…”
“Me? How about me ?” the ox says
“You can only plough or draw a cart,” the dog slightly says.
“Yes. It’s true,” the ox says. “But if I don’t plough, what do you guard?”
