在第二十世纪，我们都知道一个2位数年份的意思。

In the 20th century, we all knew what a 2 digit year meant.

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父亲节是在第二十世纪早期美国建立与此对应的庆典。

Father's Day was established in early 20th century America to correspond with this celebration.

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父亲节是在第二十世纪早期美国建立与此对应的庆典。

Father's Day was established in early 20th century America to correspond with this celebration.

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