A：Time flies!
光陰似箭!
B：You're telling me.
那還用你說。
注釋：
表示同意或肯定對方說的話時，有下列常用語：
You're telling me.
(那還用你說。——我早就知道了。)
I agree with you.
(我同意/贊成你的說法。)
You can say that again.
(你說的沒錯。)
例：A: I think Ray is a good boy.
(甲：我認為雷是個好男孩。)
B: You're telling me.
(乙：那還用你說。)