Indicating 'through' or 'via' — by means of or by way of something (a person, medium, route).
インターネットを通じて申し込みができます。
You can apply via the internet.
彼を通じてその情報を入手した。
I obtained that information through him.
留学を通じて多くの友達ができた。
I made many friends through studying abroad.
Indicating 'throughout' or 'all through' — across a whole period or extent.
この地域は一年を通じて温暖だ。
This region is warm throughout the year.
会議は朝から通じて夕方まで続いた。
The meeting continued from morning through to the evening.
彼は学生時代を通じて優秀な成績を保った。
He maintained excellent grades throughout his student years.