The tectogensis is themotive force of the continental connection and separation, and animals migration through the landbridgesbrings about interchanges between the continents.
各大陆的动物区系既有差别又有联系，构造运动曾是大陆联接和分离的原动力，动物通过“陆桥”的迁移实现了各大陆之间的交流。
Through research the theory of John Austin, Hans Kelsen, and Hart, the Separation Thesis is the key to understanding positivism, which object the necessary connection between law and morality.
通过分析奥斯丁、凯尔森以及哈特三人理论的共同点，我认为，坚持法律与道德之间不存在必然关系的分离命题是某一理论得以称为实证主义的主要条件。
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