A roll cloud is "a long, low tube of a cloud," sometimes smooth, sometimes bumpy.
卷云是“一种低矮的长管形云彩，”它时而平滑，时而臃肿。
Many officers said their biggest challenge was staying upright on the city's bumpy and sometimes pock-marked roads.
很多警察称，穿着冰鞋在该市崎岖不平、有时还坑坑洼洼的路面上站稳是他们面临的最大挑战。
It has been bumpy sometimes in the past but now I think it is all done.
过去这里有时候会很颠簸，但我想现在都搞定了。
It has been bumpy sometimes in the past but now I think it is all done.
过去这里有时候会很颠簸，但我想现在都搞定了。
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