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1·It was the fortieth anniversary of the death of the composer.

那是那个作曲家逝世40周年纪念日。《柯林斯英汉双解大词典》

2·I took it on her mother's fortieth birthday.

我在她母亲四十岁生日时拍摄的。

3·Today is his mother's fortieth birthday.

今天是他母亲的四十岁生日。

4·I'm planning to buy a gift for her fortieth birthday.

我打算为她的四十岁生日买一份礼物。

5·Nick gave his mother a scarf on her fortieth birthday.

尼克在他母亲四十岁生日时给她送了一条围巾。

6·Della expects to give her father an unusual gift on his fortieth birthday.

黛拉希望在父亲四十岁生日时送他一份特别的礼物。

7·Shenzhen Special Economic Zone celebrated its fortieth birthday on Oct. 14, 2020.

2020年10月14日，深圳经济特区迎来成立40周年。

8·All the family members are busy getting ready for my father's fortieth birthday party.

所有的家庭成员都在忙着准备我父亲的四十岁生日聚会。

9·My office is on the fortieth floor.

我办公室在第四十楼。

10·She bought the coat on her fortieth birthday.

她在四十岁生日时买下了这件大衣。