1) Take a rain check

　　thank you for the invitation, but Ill have to take a rain-check on it.感谢邀请，但我这次不能来，日后定当践约。

　　Can I take a rain check?

　　你能改天再请我吗?

　　Ill have to take a rain check on that.

　　这事我只好推迟了。

　　Give me a rain- check!

　　请再次给我机会!

　　Thanks for the invitation, but Ill have to take a rain-check on it.

　　你的邀请我心领了，感谢盛意改日一定践约。

　　Thanks for the invitation, but Ill have to take a rain check on it.

　　你的邀请我心领了,感谢盛意改日一定践约

　　2) lost count 弄不清楚

　　I have lost count of time.

　　我记不得过了多长时间。

　　Ive lost count of how many times that actress has been married.

　　我已记不清那位女演员结过几次婚。

　　I have bought so many new books these years that Ive lost count of them.

　　这几年我买的书太多了，不知道一共有多少本。

　　They lost a number of planes; the count takes a day or so to firm up.

　　他们损失了若干飞机，具体数字要一，两天才能证实。

　　I lost count of the number of times I saw him with bandages and plasters on his fingers.

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