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The first menstrual period, usually occurring during puberty.
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月经初期第一次月经期，通常发生于青春期 |
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The first message decrypted proved to have been U-boat communication from North Atlantic encrypted with 4-rotor Enigma, giving credence to the speculation about their encryption method.
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第一个被解密的消息被证明是由活动在北大西洋上的U型潜艇用4转子加密机加密后发送的，这说明了他们解密方法的正确性。 |
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The first message has been broken on February 20th, 2006.
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第一条加密信息于2006年2月20日被成功破解。 |
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The first method for estimating the intelligence of a ruler is to look at the men he has around him.
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估量一个统治者的智力，第一个方法就是看看他身边的人。 |
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The first method for estimating the intelligence of a ruler to look at the men he has around him.
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估测领导者之智能高低的第一个方法，便是察看其身边亲近人员的水平如何。 |
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The first method is that of a schemer and leads only to mediocre results; the other method is the path of genius and changes the face of the world.
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一种是计划者的方法，一味权衡后果；另一种是天才的途径，直接改变世界的面貌。 |
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The first minute of that game bought untold trauma for our Czech Republic ‘keeper Petr Cech, after Steven Hunt slid in for a challenge and caught Cech on the head with his knee.
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比赛刚开始，哼特的一次冲撞，用膝盖踢到了我们的捷克门将切赫的头，使得切赫意外受伤。 |
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The first mission to orbit Saturn, planned since the early 1980's, is a partnership of the National Aeronautics and Space Administration, the European Space Agency and the Italian Space Agency.
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美国宇航局、欧洲航天局、意大利航天局从上个世纪80年代就联合展开了进入土星轨道的计划。 |
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The first modern Olympic Games were opened in the first week of April 1896, but at that time the Greek government had been unable to fund construction of a stadium.
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第一届现代奥运会在1896年4月的第一周召开，但当时希腊政府没有能力修建一座体育场。 |
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The first modern torpedo (1866) carried an 18-lb (8-kg) charge of dynamite in its nose and was powered by a compressed-air engine driving a single propeller; its range was 200-700 yards (180-640 m).
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第一枚现代鱼雷(1866)在其头部装载了8公斤的炸药，并用压缩空气发动机带动单螺旋桨推进;射程为180～640公尺。 |
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The first month of fetal organ development is a high-risk period for the effects of drugs.
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胎儿器官发育的第一个月是受药物影响的高危期。 |
