首先,老师端起两个盛有同样多水的杯子,让同学们都认真地看看。然后她放下左边的杯子,用塑料小勺舀起一个小金橘,放到右边的杯子里,小金橘迅速地沉到了杯底。接着,老师用刚才的小勺把小金橘从那个杯子里舀出来,又轻轻地放到左边的杯子里。奇迹出现了,只见小金橘先是快速地往下沉,然后再慢慢地往上浮,最后竟然漂在了水面上。鸦雀无声的教室顿时 First, the teacher put two cups filled with the same amount of water so that the students would take a serious look. Then she dropped the cup on the left, scoop up a small kumquat with a plastic spatula and put it into the cup on the right, and the kumquat settled quickly to the bottom of the cup. Then, the teacher scoopped the kumquat out of that cup with the little toffee and dropped it into the cup on the left. Miracles appeared, I saw kumquat first quickly sink, and then slowly floating up, and finally even floating in the water. Silent classroom immediately