The first sentence is correct. The second sentence is incorrect. You could say “I ate 2 strawberries” or “I ate 2 crates of strawberries” but you cannot say “I ate them up twice.”
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You can say "I ate them all up in two sittings."
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I guess 'twice' isn't a good measurement even in Chinese. 更确切的说吃了两天,或者两个人吃,或者说一次吃不完可能更合适?That would be I ate it for two days, OR It takes two to finish it. OR I can't finish it in one go
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In the way I understand what you said, I think you had eaten the three pounds just in two rounds
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If you eat something twice, something very bad has happened.