古希腊大哲学家苏格拉底说“世界上的许多东西其实都是十分宝贵的。当我们拥有它的时候浑然不觉,而一旦失去它,便感到它的宝贵了”。其实,在我们生活中也有类似的事情发生。在我们那幢楼的楼梯口,安装着一盏灯,大概25瓦左右,只能让人看清楼梯。虽然如此,但它还是尽心尽力地为我们服务。一位体形偏胖的大婶回来了,一边用力敲门,一边大声地说:“快来开门呀,你要知道如果我在这里待上一秒,我的头都会晕,太暗了呀!”丈夫匆忙给她开了门,里面立即射出明亮的白炽的光。那位大婶快 Socrates, an ancient Greek philosopher, said: “Many things in the world are in fact very precious, and when we have it, we are unaware of it, and once we lose it, we feel it is precious.” In fact, similar things happen in our lives. In our stairwell, there is a light, about 25 watts, which can only make people see the stairs. Nonetheless, it does its best to serve us. A body fat over the side of an inch back, while hard knock on the door, said aloud: “Come on, you have to know if I stay here for a second, my head will be dizzy, too dark! ”Husband hurriedly opened her door, which immediately fired a bright incandescent light. That lady is fast