But when that's not true, then there is a typical sort of modern frontier, a land bridge which there a line is-a theoretical line is drawn through it, and on one side is one city, and the other side is another city.

但还不止这些天然边界,另外还有种边界形式,和现代国境线很类似,是由一座陆桥,分割出一条界线…假象的界线,界线的一边是一个城邦,另一边是另一个城邦

耶鲁公开课 - 古希腊历史简介课程节选

Notice I close the quotes after I'm putting a new line-- after I'm putting this new line, name but then to the right hand side is comma name.

注意反斜杠n后面加上后引号-,后引号，再右边就是逗号。

哈佛公开课 - 计算机科学课程节选