The typical trench system in World War I consisted of a series of two, three, four, or more trench lines running parallel to each other and being at least 1 mile (1.6 km) in depth.
第一次世界大战时典型的堑壕体系由2至4条以至更多的一系列壕沟组成，壕沟之间彼此平行，而且纵深可以达到1英里（合1.6公里）。
The world of 1, 000 years ago was a miserable place: dirty, war-scorched and mostly illiterate.
1000年以前的世界很是悲惨：肮脏，战乱，大多数人目不识丁。
World War Three is just around the corner and the planet is teetering on the brink 1 of all-out conflict - according to people in major Western nations, at least.
第三次世界大战即将爆发，世界即将面临全面冲突——至少主要西方国家的民众是这样想的。
World War Three is just around the corner and the planet is teetering on the brink 1 of all-out conflict - according to people in major Western nations, at least.
第三次世界大战即将爆发，世界即将面临全面冲突——至少主要西方国家的民众是这样想的。
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