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

foreset的音标：foreset的英式发音音标为：['fɔ:set]foreset的美式发音音标为：['fɔset]...

n.临时超前支护，前积...