专家给大学生们上过这么一堂课。他拿出一个大大的广口瓶,将准备好的石块放进瓶子,直到石块高出瓶口再也装不下。他问:“瓶子满了吗?”所有学生答道:“满了!”然而他又将一桶砾石倒进瓶子,并摇晃瓶子使砾石填满石块的间隙。“现在瓶子满了吗?”学生有些明白了,“可能没满。”果然,他又将一桶沙慢慢倒进瓶子,“满了吗?”专家又问。“没满!”只见他拿过一瓶 Experts to college students had such a lesson. He took out a big jar, put the prepared stone into the bottle, until the stone can not fit under the bottle. He asked, “Is the bottle full?” All the students replied: “Full!” But he poured a bucket of gravel into the bottle and shaken the bottle so that the gravel filled the gap between the stones. “Is the bottle full now?” Some students understood that “may not be full.” “Sure enough, he slowly poured a bucket of sand into the bottle again,” Is it full? “The expert asked again. ”Not full! " I saw him take a bottle