A new study shows that unhappiness in middle age, also known as mid-life crisis, is a universal experience.
一项新的研究表明中年的苦恼，也叫中年危机，是一种世界性的现象。
The second chapter discusses the situation of the Northeast Asia in the mid-seventh century and li Jinxing's life experience.
第二章论述了七世纪中期东北亚的局势及李谨行身世考述。
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