The barriers to unity presented by European geography and very limited technology made it hard for a would-be conqueror to create a vast empire, eliminating competitors and imposing his will over vast areas.

由于欧洲独特的地理条件,和当时有限的科技水平,使未来的征伐者很难建立一个广袤的帝国,清除异己和使他的意志,传播到广袤领地的每一个角落

耶鲁公开课 - 古希腊历史简介课程节选

there's some pretty nice areas to walk around up there over on the hillside, so.

会有很多美丽的景色，走走就可以到山上。

旧金山的景点 - SpeakingMax英语口语达人