Today is a national holiday in Japan. It is Sports Day.

今天是日本的国定假日：体育日。

In the USA, Labor Day is a national holiday.

在美国，劳动节是一个国家节日。

A national holiday was proclaimed.

宣布了一个国定假日。

A national holiday was proclaimed.

宣布全国放假一天。

Tuesday has been declared a national holiday.

星期二已被宣布为国定假日。