〜を通じて／を通して
Through; throughout (a period)machine translation
FormationNoun + を通じて／を通して
The first meaning: "through" an intermediary or medium: 友達を通じて彼女と知り合った (I got to know her through a friend), インターネットを通して世界のニュースを知る (learn world news through the Internet). Information or relationships pass THROUGH a connecting bridge — that is the image of this pattern.
The second meaning: with a noun indicating a span of time, the pattern means "throughout, for the whole of": 一年を通じて暖かい (warm throughout the year), 一生を通して (throughout one's life).
The two forms を通じて and を通して are nearly interchangeable; を通して puts slightly more emphasis on actively using that means, while を通じて is neutral and a bit more formal. Distinguish from によって: によって presents the means or method that directly produces the result, whereas を通じて always keeps the image of "passing through an intermediary."
Examples
友達を通じて彼女と知り合いました。
I got to know her through a friend.
インターネットを通して、世界のニュースをすぐに知ることができます。
Through the Internet, you can learn world news right away.
この町は一年を通じて暖かいです。
This town is warm throughout the year.