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ninetieth的音标：ninetieth的英式发音音标为：['naɪntɪəθ]ninetieth的美式发音音标为：['naɪntiɪθ]...
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n.第九十，九十分之一adj.第九十的，九十分之一的...
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He celebrates his ninetieth birthday on Friday.他周五过90大寿。This is like the ninetieth time I called you!我都给你打了九十几遍电话了!Today is the ninetieth anniversary of our dead Grandpa.今天是爷爷90岁冥寿的日子....
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ninetieth的复数形式为：ninetieths...