雅思英语
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纽约时间比加州时间早三个小时， New York is 3 hours ahead of California, 但加州时间并没有变慢。 but it does not make Californiaslow. 有人22岁就毕业了， Someone graduated at the age of 22, 但等了五年才找到好的工作！ but waited 5 years before securing a good job! 有人25岁就当上CEO， Someone became a CEO at 25, 却在50岁去世。 and died at 50. 也有人50岁才当上CEO， While another became a CEO at 50, 然后活到90岁。 and lived to 90 years. 有人依然单身， Someone is still single, 同时也有人已婚。 while someone else got married. 奥巴马55岁就退休， Obama retires at 55, 川普70岁才开始当总统。 but Trump starts ...
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集合与简易逻辑 集合（集） set 非负整数集 the set of all non-negative integers 自然数集 the set of all natural numbers 正整数集 the set of all positive integers 整数集 the set of all integers 有理数集 the set of all rational numbers 实数集 the set of all real numbers 元素 element 属于 belong to 不属于 not belong to 有限集 ...
