陡斜的前积层只有在非常严格的条件下才能形成.Steeply tilted foreset beds are formed only under very restricted condition.顶积 、 前积和底积层均正常发育.Topset, foreset, and bottomset beds normally developed....

“前积”的英语可以翻译为：foreset ...

“前积”的拼音为：qián jī...