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New Concrete Recipes Could Cut Cracks能够对抗公路裂化的新型混凝土配方 There's a stretch of highway in Pennsylvania, along U.S. 422. And like every probably 20 feet you see a big pothole or cracking at the joint. Like everywhere. It wa
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Template - an outline form which can be used to make many identical copies without being used itself. Metal templates can be used placed over a piece of clothing material, which is then cut according
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DNA is the fundamental molecule the carries genetic instructions that help build the living world. DNA是携带遗传指令最基本的分子，帮助建造了生机勃勃的世界。 Humans have DNA. Pigs have DNA. Even bacteria and some viruses hav
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