n.第九十，九十分之一
adj.第九十的，九十分之一的
He celebrates his ninetieth birthday on Friday.
他周五过90大寿。
Today is the ninetieth anniversary of our dead Grandpa.
今天是爷爷90岁冥寿的日子.
This is like the ninetieth time I called you!
我都给你打了九十几遍电话了!
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