在这个让人产生错觉的图案中，心好像在动，甚至是随着目光的移动而均匀地游动。

In this illusion, the heart appears to move and even pulsate as you look around the image.

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图：当鲨鱼移动时，尾巴会产生两个连接在一起的流动的水圈(蓝色和红色代表相反的水流)，这使得鲨鱼有着强大的游动能力。

Image: As it moves, a shark's tail (shown) creates two connected rings of moving water (blue and red represent opposing flows) that help make this fish such a powerful swimmer. (Brooke E. Flammang).

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浮游植物密度与浮游动物的昼夜垂直移动关系不密切。

The diel vertical migration of zooplankton was irrelevant to the phytoplankton density.

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