Roll out again, and once more fold in thirds to form three layers.

然后再将面团擀开，再重复之前的折叠动作，又形成新的三层。

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When this happens uniformly across a large front, a roll cloud may form.

由于同时发生在一个面积广阔的锋面，于是就形成了这种卷云。

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Some species simply live in the dung, while others form perfectly spherical dung balls, which they roll with their hind legs, often over large distances, to a place where they can bury it.

部分蜣螂干脆居住在粪便当中，其他蜣螂用自己的后足将粪便滚成完美的球形，进行距离的运输，直到到达它们埋藏粪球的地方。

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