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21-12-01 这几天这么冷,小伙伴们是不是都分分钟都想把自己裹成粽子出门? 在英文里我们问对方穿了多少件衣服,不要说how many clothes,而要问: how many layers are you wearing? 你今天穿了多少层? 除了衣服这一种御寒神器,heating和heater其实都是取暖设备,前者一般是像...
11-04-28 researchers at the national institute of standards and technology (nist) have shown that the electronic properties of two layers of graphene(石墨烯) vary on the nanometer scale. the surprising new results reveal that not only does the difference i...