俄国著名的化学家门捷列夫为探求化学元素之间的规律,研究和思考了二十年的时间,却未取得突破,但他对此研究仍然如痴如醉。曾有一次,他的友人来看望他时,见到他在办公室中走来走去,紧皱双眉,桌上还铺满了卡片。原来门捷列夫为了研究化学元素之间的规律,已经几天没出办公室了。他尝试了各种可能的表格形式都不成功,但是他并不气馁。有一次,他连续三天三夜坐在办公桌旁苦苦思索,试图将自己的成果制成周期表,可是没有成功。大概是太劳累的缘故,门捷列夫坐在椅子上就睡着了。突然他被惊醒,因为他梦见了一张清晰的元素周期表,他急忙把梦中的那张表画了下来。门 The famous Russian chemist Mendeleev explored the law between chemical elements, studied and pondered over two decades, but did not make any breakthroughs, but he is still mesmerized by this research. Once, when his friends came to visit him, he saw him walking around the office, wrinkling his eyes and eyebrows, and the table was covered with cards. Mendeleev had been out of office for a few days in order to study the laws between chemical elements. He tried all possible forms of the form unsuccessfully, but he did not feel discouraged. Once, he sat at his desk for three days and three nights in a row thinking hard and trying to make his own achievements into a periodic table. However, he did not succeed. Probably too tired, Mendeleev fell asleep in his chair. Suddenly he was awakened, because he dreamed of a clear periodic table of the elements, he hurriedly painted the table in the dream down. door