合适的长度和高度。
Most fish can see in low-light conditions or dirty water, and a few can see objects over moderately long distances.
大部分鱼都可以在低光条件下或在脏水里看见东西，还有一些可以看见中长距离的物体。
Most fish can see in low-light conditions or dirty water, and a few can see objects over moderately long distances.
大部分鱼都可以在低光条件下或在脏水里看见东西，还有一些可以看见中长距离的物体。
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