2

　　placed about a dozen fist-sized rocks, one by one, into the jar.

　　When the jar was filled to the

　　3

　　and no more rocks would fit inside, he asked, “Is this jar

　　4

　　?” Everyone in the class said, “Yes.”

　　“Really?” Then he

　　5

　　under the table and pulled out a bucket of gravel（沙砾，石子），dumped some in and

　　6

　　the jar, causing pieces of gravel to work themselves down into the space

　　7

　　the big rocks. Then he asked the group the same question. “Probably not.” One of them answered. “Good!” he replied.

　　He reached under the table and

　　8

　　a bucket of sand. He started dumping the sand in the jar and it went into all the

　　9

　　left between the rocks and the gravel.

　　10

　　he asked the question. “No!” the class shouted. “Good!” Then he grabbed a can of water and began to pour it in

　　11

　　the jar was filled to the brim.

　　Then the expert in time-management looked at the class and asked, “What is the

　　12

　　of this illustration?” It is such a seemingly easy question that one

　　13

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