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音标：thirty 英[ˈθɜ:ti] 美[ˈθɜ:rti] 意思：n. 三十，三十个 adj. 三十的，三十个的 例句： She's well over thirty, but still behaves as a child. 她三十好几岁了，行为举止还很幼稚。 The building was built about thirty years ago. 这幢楼建于约30年前。 She...