Without it, we can not understand the changeable world prospects during past centuries.
如果没有它的话，我们无法解释建构过去几个世纪文化变迁的世界图景。
The most difficult thing in the world of the changeable world remain the same relationship.
这个世界最难的事莫过于在多变的世界里维持不变的关系。
At present the world situation is complicated and changeable.
当今的世界纷繁复杂，变化多端。
At present the world situation is complicated and changeable.
当今的世界纷繁复杂，变化多端。
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