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1·He celebrates his ninetieth birthday on Friday.

他周五庆祝他的90岁生日。《柯林斯英汉双解大词典》

2·She was ninetieth in the competition.

她在那场比赛中排名第九十。

3·This is the ninetieth edition of this book.

这是本书的第九十版。

4·She is like the ninetieth person on the list.

她好像是名单上的第九十位。

5·The ninetieth customer will win a surprise gift.

第九十名顾客将会赢得一份惊喜大礼。

6·Our company will soon celebrate its ninetieth anniversary.

我们的公司不久就要庆祝九十周年了。

7·We are celebrating our grandpa's ninetieth birthday next week.

我们下周将庆祝爷爷90岁生日。

8·My mother has no idea that her ninetieth birthday is coming up.

我的母亲，她的第九十天的生日快到了，不知道。

9·This year, Junior Achievement marks its ninetieth anniversary of educating young people about business and economics.

今年，青年成就组织庆祝其为年轻人提供商业和经济方面的教育90周年。

10·For any country ratifying or acceding to it later this Convention shall enter into force on the ninetieth day after the said country has deposited its instrument of ratification or accession.

若有的国家嗣后批准或加入，本公约将自该国交存其批准或加入的文件后的第九十天起，开始对该国生效。