一天晚上,小刚正在看画报,突然,“彭”的一声,吓了他一跳!他抬头一看,哦!原来是桌上的热水瓶塞跳出来了。小刚从地上拣起瓶塞,洗干净后盖在热水瓶口上,又看起画报来了。不一会儿,热水瓶塞又“彭”的一声跳了出来。小刚觉得很奇怪。爸爸回来了,小刚问:“爸爸,热水瓶塞为什么自己会跳出来?” One night, Xiao Gang was looking at the pictorial. Suddenly, “Peng” sounded and shocked him! He looked up, oh! It turned out that the thermos jumped out on the table. Xiaogang picked up the cork from the ground, washed and covered in a hot water bottle mouth, but also look pictorial came. A moment later, thermos cork and “Peng” soon jumped out. Xiaogang feel very strange. Daddy came back, Xiao Gang asked: “Daddy, why did the thermos bottle come out?”