middle stage

• 中级阶段

middle stage的用法和样例：

例句

1. Horticulture, probably unknown to Asiatic barbarians of the lower stage, was being practiced by them in the middle stage at the latest, as the forerunner of agriculture.
   园圃种植业大概是野蛮低级阶段的亚洲人所不知道的，但它在那里作为田野耕作的先驱而出现不迟于中级阶段。