If you had a motor here that was causing a paddle to move up and down you could cause waves to form at one end of the tank and move from left to right.
如果这里有一个马达，使桨上下移动，就可以在水槽的一端形成波浪，从左到右扩散。
2
Now the bottom — the little underscore in the bottom right hand corner represents the blank tile and just as with my thumbs I would move 4 down or maybe 2 to the right.
现在下方，右下方的下划线表示空白片，我可以用手指将4移下来，或者将2移到右边。
3
The week after we implemented the so-called game of 15, this little party favor where you move the Numbers up, down, left or right.