介绍:
A:I can’t believe I forgot about your birthday. I am such a bad friend.
B:Don’t worry about it. It’s water under the bridge.
A:I promise I won’t forget again. Next year I’ll be sure to get you something extra nice.
笔记：
water under the bridge 已成往事，往事云烟
Don't worry about that mistake；it's water under the bridge.
别担心这个错误，它已经无关紧要了。
练习：我完全不记得他欠我的钱了。
I’ve completely forgotten about the money he owned me.
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