那些似空中楼阁一般的美好，与空洞的人群已然渐行渐远。

Those beautiful like a castle in the air, and hollow crowd away already.

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妻子离开后，他的人生中出现了一大片空洞。

After his wife left, there was a gaping hole in his life.

《牛津词典》

对很多熟悉历史的人来说，“21世纪启蒙”这个词听起来很空洞。

The phrase '21st century enlightenment' rings hollow for many historically attuned ears.

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