Two classes of people move up their hands.

两班人马动起了手。

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。

Can you move up a bit?

你请挪过去点儿好吗？

Move up, John, and let the lady sit down.

约翰，挪一挪，让这位女士坐下。

There's room for another one if you move up a bit.

如果你挪开一点，这里还可以容纳多一个人。