教授拿起一盒沙子，把所有这些沙子都倒进罐子。
The professor next picked up a box of sand and poured it into the jar.
教授接下来拿起一盒沙子倒进杯里，当然沙子填满其余的空隙。
The professor next picked up a box of sand and poured it into the jar. Of course, the and filled up everything else.
接着，教授又拿起一盒沙子倒入罐子里。
The professor next picked up a box of sand and poured it into the jar.
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