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.

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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.
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.

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.
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