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。
Like a bechamel sauce, the resulting book is sometimes smooth, but occasionally lumpy.
像白酱汁一样，这本集结成册的书有时平顺，偶尔也有起伏。
Car through the bend of the Hill, sometimes bumpy, sometimes smooth, fast enough, given me opportunities to visit the mountains.
汽车经过弯曲的山道，时而颠簸，时而平缓，速度不快，给了我浏览山的机会。
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