Imagine a tribal leader in a desert area where sand is everywhere. There are no trees, rivers or mountains, nothing to look at and say, "This is the border of our land, this is the place that we will fight to defend." Since there are no natural landmarks to relate to, that commander then takes a stick and drags it along the ground, (and in that sense "draws" a line in the sand), and says, "Here is the border of our land that we will fight to defend.
基于1个网页-相关网页
"Map" — a drawing of a particular area for example a city or country which shows its roads, rivers, mountains etc.
地图- - - - -可以勾画出一个特有的区域，例如城市或者国家，我们可以从中找到马路，河流以及山峦等。
Friends or families often ride together in mountains or along rivers during the weekends.
周末常有好友或家人结伴骑乘在山中或河边。
The dominions of kings are limited either by mountains or rivers, or a change of manners, or an alteration of language.
国王的领土都是有限的，或限于山脉河流，或限于风俗习惯的改变，或限于语言的不同。
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