formation cause

• 成因

formation cause的用法和样例：

例句

1. The obliquity of the ecliptic is the fundamental cause of the seasons.
   黄道的倾角是季节的基本成因。
2. The cause of formation and harm of the land subsidence are introduced, and the control measures are brought forward.
   摘要介绍了地面沉降的成因和危害，提出防治措施。