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在“3+7=10”这个等式中,加数3和7以及它们的和10都是已知的,没有任何悬念。如果其中一个加数是未知的,就有点意思了。像
In the equation “3 + 7 = 10 ”, the additions 3 and 7, and their sum 10, are known without any suspense. If one of the addends is unknown, it is a bit mean. Like