To our great disappointment, we found we did not have the key with us. We had left it at home without our knowing it.
令我大失所望的是：我发现自己没带钥匙，不知不觉地把钥匙丢在了家里了。
To our great disappointment, some students still can not go without snacks, littering wrapping papers and plastic bags here and there.
让我们非常失望的是，一些同学仍然不能离开零食，把包装纸和塑料袋到处乱扔。
To our great disappointment, some students still can not go without snacks, littering wrapping papers and plastic bags here and there.
让我们非常失望的是，一些同学仍然不能离开零食，把包装纸和塑料袋到处乱扔。
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