There is a wall around Paris and there are exterior forts, but you've got an enormous number of people besieged by Prussian and other German forces, holding on.

在巴黎外围高墙林立,堡垒遍地,但仍有大批民众,在普鲁士和其他德国军队的围攻中坚守阵地

耶鲁公开课 - 1871年后的法国课程节选

Syracuse finds itself besieged by the Athenians.

锡拉库萨被雅典人围攻

耶鲁公开课 - 古希腊历史简介课程节选

If you're expecting to be attacked and besieged, as all these citadels would be by an invader, you would want more than anything else a water supply, but they didn't necessarily have good water supplies in such circumstances.

如果你预料到会被攻击和包围,就像这些城邦面对侵略者那样,你最关心的一定是水源供应,但在这样的情况下,他们未必能找到充足的水源

耶鲁公开课 - 古希腊历史简介课程节选