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有这么一个真实的故事:某小学一个二年级的学生,周末到郊外游玩时拾回两颗漂亮的小石子,便拿去问他的老师。老师端详了好半天,总是认不出来。就抱歉地说:“我不知道,还是去问你的爸爸吧。”小学生的爸爸是地质物探队的工程师,识别两颗普通的小石子,是绝对没有问题的。可他看了小石子之后,思忖一下却对孩子说:“这是什么石子我也不知道,你明天再问老师,老师肯定会给你讲清楚的;顺便替我
There is such a real story: a sophomore in primary school, went to the outskirts of the weekend to play back two beautiful pebbles, they took to ask his teacher. The teacher looked carefully for a long time, always recognize it. Sorry and said: “I do not know, or to ask your father.” Pupils’ father is an engineer of geophysical team, identify two ordinary pebbles, there is absolutely no problem. But after he looked at the pebbles, he said to his children, "What is this pebble I do not know, you will ask the teacher tomorrow, and the teacher will certainly give you a clear explanation. By the way,