前积的英文

progradation

• 前:    front
• 积:    amass; store up; a ...
• 前积层:    foreset bedding; f ...

例句与用法

1. Topset, foreset, and bottomset beds normally developed .
   顶积、前积和底积层均正常发育。
2. 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。