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in short; the point is; the important thing is; in a word; basically
要は時間が足りないということだ。
In short, there is not enough time.
要は努力次第で結果は変わる。
The point is, the result changes depending on your effort.
要は相手の立場で考えればいい。
In short, you just need to think from the other person's perspective.