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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This'll just take a minute. Olive oil producers generally guess the best time to harvest their olives by checking the fruits color. The olive has to hit that perfect spot where they
发表于:2019-01-08 / 阅读(71) / 评论(0)
Scientific American(五)月
Scientific American(五)月