马凡综合征二尖瓣，见小叶增大， 在左方远处的一个小叶向上隆起。

The mitral valve is shown in the same patient with Marfan's syndrome. The leaftlets of the mitral valve are redundant, and the one on the far left is ballooned upward.

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如果沿顺时针方向走，就会发现这个曲面在左方，或者用右手定则来判断。

If you walk clockwise, you will see that the surface is to your left or use the right-hand rule.

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我们将运用与步骤16相同的方法，在云彩左方添加一些飞鸟。

We are going to add some birds to the right of the clouds the same way we made the clouds in Step 16.

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