元旦是新年的第一天。

Yuándàn shì xīnnián de dì yī tiān.

New Year's Day is the first day of the year.

我们在元旦举行了一场盛大的晚会。

Wǒmen zài yuándàn jǔxíng le yī chǎng shèngdà de wǎnhuì.

We held a grand evening party on New Year's Day.

他们在元旦去了海边度假。

Tāmen zài yuándàn qù le hǎibiān dùjià.

They went on a seaside vacation on New Year's Day.