中国人有一句口头语:“人生在世”。译成白话就是,人生在世界之中,借用海德格尔的语言来说,即“在世界之中存在”(In-der-Welt-sein)。所谓“在世界之中”,或简称曰“在之中”(In-Sein),究竟是什么意思?人总归是在世界之中,这是不待言的,问题是如何“在之中”?对于“在之中”如何理解?这个问题实际上是人和世界的关系问题。按照海德格尔的说法,有两种意义的“在之中”:一是指两个现成的东西,其中一个在另一个“之中”,例如水在杯子“之 Chinese people have a spoken language: “life is alive.” Translated into vernacular is the life in the world, borrowed Heidegger’s language, “in the world” (In-der-Welt-sein). The so-called “in the world”, or simply “In-Sein,” what exactly does it mean? People are always in the world, which is not to be said, the question is how “among them”? How to understand “being”? This question is actually the question of the relationship between man and the world. According to Heidegger, there are two meanings “in”: one refers to two ready-made things, one of which is in the other, such as water in the cup