At present the main tasks faced with by geography are to oppose both environmental decisionism and conquering theory, and to advocate harmonious or co-ordinated human-land relation.
当前我国地理学面临的任务仍然是既要反对环境决定论，又要反对征服论，提倡和谐的或协调的人地关系论。
A wave twin screw element was designed on the basis of meshing theory and motion relation for co-rotating twin screw extruder by introducing wave screw structure in this paper.
本课题根据啮合同向双螺杆啮合原理及螺杆运动关系，将波状螺杆结构应用到双螺杆挤出机中，设计了一种波状双螺杆元件。
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