The tunnel is suspended in the middle of the shark tank.

这条隧道悬浮在鲨鱼水槽的中间。

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For example, you could put a dam in the middle of the tank.

举个例子，在水槽中间放个屏障。

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For example, you could put a dam in the middle of the tank.

举个例子，在水槽中间放个屏障。

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