标签：摩擦 相关文章
When they hear the name Ben Franklin, many folks think of the Declaration of Independence, the Continental Congress and things like that. Not as many people remember that Franklin was an inventor . . . and a good one, too! He also did some pioneering
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图片1 fragile adj. 易碎的，脆的 例句：Glasses are fragile and must be handled with great care. 玻璃制品易碎，必须小心轻放。 fragments n．碎片，断片，片段 例句：Carry dropped the vase on the floor and it broke into
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Why Does Plastic Wrap Cling To Itself? What makes kitchen plastic wrap cling so maddeningly to itself, and so conveniently to the sides of bowls and plates? Plastic wrap clings for two reasons: its elastic and its sticky. That probably seems pretty o
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白宫同以色列关系摩擦增加 On both sides, there has now been injected a degree of partisanship, which is not only unfortunate, I think it's destructive of the fabric of the relationship. 给双方徒增一场党派之争，不仅不幸，而且
VOA标准英语2015年(七月)
What Are Calluses And How Are They Formed? 皮肤上的茧是如何形成的？ 人体皮肤由于劳动过程长期摩擦造成皮肤表皮细胞坏死而形成的，主要出现于手掌、足掌等部位。长时间的受到磨檫,组织细胞的老
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Reentry Heat [Why does a space shuttle get hotter on reentry than on liftoff?] 能想象航天飞机穿越大气层时受到摩擦产生的热量有多惊人吗？来一起听听吧。 M:Dolle,we now know that the space shuttle Columbia burned up whe
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