Heat and Cold

A class of Physics at school. The teacher: "Now, who can tell me anything about heat?" A small boy held up his hand: "Heat makes things larger, Sir, and cold makes things smaller." “All right! ”Give an example." "In summer days are longer because it is hot, in winter they are shorter because it is cold."

热和冷

学校里正在上物理课.
老师提问:"现在谁能讲一讲对热的认识?"一个小男孩举手回答:"老师,热能使东西膨胀,冷能使东西缩小."老师说:"很好,举一个例子.""夏季,白天变长,因为天气太热；冬季白天缩短,因为天气太冷."