mind you
We use this expression to introduce an idea or fact that contrasts with the previous idea in some way.
我們用這個表達來引入一個想法或事實，在某種程度上與之前的想法形成對比。
A：It took my friend 10 hours to finish the London marathon. Mind you, she is over 80.
我的朋友花了10個小時才跑完倫敦馬拉松。注意，她已經80多歲了.
B：Well then, it's amazing that she finished it at all.
那她能完成就真的很不可思議了。