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1. Absolutely!/ Definitely! 那当然！ 2. It's certain. 那是一定的。 3. It's for sure! / Sure thing! 那是一定的！ 4. You bet! / You betcha! / You bet your life! 我可以打包票！ 5. No doubt! / There's no doubt about it! 毫无疑问！

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