直译：不知天上宫阙今夕是何年

Translation: Not knowing what year it is tonight in the celestial palace.

意境翻译：这句诗表达了诗人对天宫的向往与神秘，以及对时间流逝的感慨。它暗示了诗人身处凡尘，却对天上的美好世界充满好奇，却不知那片天地此刻的岁月流转。

In this line, the poet expresses a yearning and mystery towards the celestial palace, as well as a sense of contemplation over the passage of time. It implies that the poet, while dwelling in the mundane world, is curious about the beautiful world above, yet unaware of the passage of time in that celestial realm.

英语版对照：

Unknown is the year in the celestial palace, as it is tonight,

In the realm of the gods, what time does the clock strike?