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。
The ball really follows a smooth curved path, so why do batters sometimes look so foolish swinging at them?
球确实顺着平滑弯曲的道路，那么为什么击球者有时会看起来如此愚蠢地去摆动它们？
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