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One day, an expert in time management was speaking to a group of students and, to drive a point home, used an illustration those students will never forget. As he stood in front of the group of overachievers he said, "OK, time for a quiz." He pulled out a one-gallon, wide-mouth jar and set it on the table in front of him. He also produced about a dozen fist-sized rocks and carefully placed them, one at a time, into the jar. When the jar was filled to the top and no more rocks would fit inside, he asked, "Is this jar full?" Everyone in the class yelled, "Yes." The time management expert replied, "Really?" He reached under the table and pulled out a bucket of gravel. He dumped some gravel in and shook the jar, causing pieces of gravel to work themselves down into the spaces between the big rocks.
一天，一位时间管理方面的专家为学生做演讲。他现场做的演示给学生们留下了都难以磨灭的印象。 站在那些能力超强的学生前面，他说道：“我们来做个小测验吧。”于是便拿出了一个1加仑的广口瓶放在面前的桌上。随后，他取出一堆拳头大小的石块，仔细地一块块放进广口瓶。直到石块高出瓶口，再也放不下了，他问道：“瓶子满了吗？” 所有学生喊道：“满了！”。时间管理专家反问：“真的？”他伸手从桌下拿出一桶砾石，倒了一些进去，并敲击广口瓶壁，使砾石填满石块的间隙。