教授接著倒入一盒细沙；当然细沙很容易地填满了每个小空隙。

The professor next picked up a box of sand and poured it into the jar. Of course, the sand filled up everything else.

youdao

教授接著倒入一盒细沙；当然细沙很容易地填满了每个小空隙。

The professor next picked up a box of sand and poured it into the jar. Of course, the sand filled up everything else.

youdao