The War 战争 There were a lot of wars in our history. 历史上曾发生过很多次战争。 People make wars to get something. 人们为了得到某些东西而发动战争。 In the old days, some countries invaded other countries to expand thei

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Slavery 奴隶制度 Slavery began a very long time ago. 奴隶制度源远流长。 People bought slaves with money. 人们用钱买奴隶。 Sometimes slaves' lives were miserable. 有时奴隶的生活很悲惨。 Some people treated slaves as ani

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President 总统 The president is a leader of a country. 总统是一国领导人。 The president represents his or her country toward other countries. 总统代表国家与他国开展活动。 The president is serving for a country. 总统为国家服

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Craft 手工 Crafts are activities and hobbies for making something. 手工是制作某些东西的活动和爱好。 People do crafts with their hands and skill. 人们用双手和技巧来制作工艺品。 A lot of crafts need skill, speed and pat

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Addition 加法 Addition is the process of putting numbers together. 加法是把数字放在一起的运算过程。 Addition is one of the simplest things in math. 加法是数学中最简单的运算之一。 It is very basic in math as well. 它在

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Calculator 计算器 A calculator is a device for calculations in math. 计算器是数学上用于计算的工具。 It is not a computer. 它不是计算机。 And it is usually small, digital and inexpensive. 它通常是小巧且廉价的电子产品

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Lullaby 摇篮曲 A lullaby is a quiet song for children. 摇篮曲是平和的歌曲,专为儿童谱写的。 It helps children go to sleep. 它有助于孩子入睡。 You may still remember your mother's lullaby songs. 你可能还记得妈妈哼得

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Hexagon 六边形 A hexagon is a shape that has six edges and six vertices. 六边形是有六条边和六个顶点的图形。 In other words, a hexagon has six angles and six straight sides. 换句话说,六边形有六个角和六条直边。 Th

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