You'll see why very soon, in such a way that the derivative is this given unit vector u hat.
你很快就会明白为什么,导数dr/ds等于给定的单位u向量。
Park shot to stardom after scoring a hat-trick to help unfancied South Korea to a convincing 3-0 win against host China in the 2004 AFC U-19 Women's Championship final.
在2004年举行的女足亚青赛上，朴恩善的帽子戏法帮助名不见经传的韩国队3比0大胜东道主中国队，一战成名。
Plus the U. S. and Israel are close Allies so visiting that country reinforces this strength of hat relationship.
加上美国和以色列是亲密盟友，因此访问那个国家加强这种关系。
The suggestion that Canada is a nicer place to live than America is pretty old hat for most U. S. citizens these days: Vancouver is ranked number four.
加拿大的生活比美国更舒适的说法，对于今天多数美国人来说都是相当过时了，但美世公司把温哥华排在了第四位。
Stinging cold rain ran off the brim of his hat and dripped down the back of U. S. Marshal Sam Chance's neck.
冰冷刺骨的雨水从帽檐上滑下来，滴在美国执法官萨姆·钱斯的脖子后面。
Stinging cold rain ran off the brim of his hat and dripped down the back of U. S. Marshal Sam Chance's neck.
冰冷刺骨的雨水从帽檐上滑下来，滴在美国执法官萨姆·钱斯的脖子后面。
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