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。
A gap in two large ice sheets would create a connection from lands near present day Alaska, through Alberta and into the continental United States.
在两个大冰原之间有个裂缝，将今天的阿达斯加州、亚伯达（加拿大西部的一个省）和美国大陆连接在一起。
A gap in two large ice sheets would create a connection from lands near present day Alaska, through Alberta and into the continental United States.
在两个大冰原之间有个裂缝，将今天的阿达斯加州、亚伯达（加拿大西部的一个省）和美国大陆连接在一起。
应用推荐