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。
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Both the international envoy to Bosnia and the international crisis Group, a think-tank, said Bosnia was facing its worst crisis since the end of the fighting in 1995.
To recreate the effect of heat flowing through the planet's interior, the researchers stirred this brew with iron paddles attached to iron discs placed at each end of the tank.