科研之友
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<正>If the water in a glass is very hot, you will not drink it.Maybe you’ll add some cold water to it before you drink,when you are thirsty.But do hot water and cold water mix?How can you be sure of your idea? You’d better do an experiment to test your idea.Okay, try to do it.如果杯子里的水很热,你就不会喝了。当你口渴的时候,也许你
