through The department,through its cooperative state research,education,and extension service,has been supporting a project in Michigan .That state has a short growing season.
问题描述：
through
The department,through its cooperative state research,education,and extension service,has been supporting a project in Michigan .That state has a short growing season.
答
在这里它用做介词,介词后通常跟短语,在这里的意思是：通过,穿过,凭借