Parents should be alert to these changes in a child \ 's behavior.
家长应该警惕孩子这些方面的行为变化。
Great changes have taken place in the city since the 90's.
自90年代以来，这座城市发生了巨大变化。
Since the 1930's, jeans have been through many different changes in style.
自从1930年代起，牛仔服在款式上已经历了多次不同的变化。
Great changes took place in China in the1990? S.
中国在二十世纪九十年代发生了巨变。
Consequently great changes have taken place in people 's concept of security in u.
人们的安全观念也随之发生了巨大转变。
Consequently great changes have taken place in people 's concept of security in u.
人们的安全观念也随之发生了巨大转变。
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