If you use the app called Duolingo, this is actually built in; you can track each other's progress, and when you see your friend or relative, uh, performing really well on Duolingo, it motivates you to do more Duolingo and to learn more English.
如果你有用一個叫 Duolingo 的 app,這其實是內建的,你可以跟蹤對方的進度。當你看到朋友或親人在 Duolingo 表現得非常好,就會激勵你用 Duolingo 學習更多的英語。