彩虹色的箭头仅仅是为了增强效果而已。

The rainbow colors are just for added effect.

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首先，详细描述一下这个效果：在彩虹外随机显示蝴蝶并飞出屏幕。

To begin, start with a detailed description of the effect: Randomly have butterflies appear out of the rainbow and float up the screen.

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彩虹(4 k)—旋转效果是通过使彩虹中每种颜色的stroke - width和stroke - dashoffset产生动画效果而获得的。

Rainbow (4k) — the spinning effect is achieved by animating the stroke-width and stroke-dashoffset of each color in the rainbow.

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