Another option: Climb high and look for signs of human habitation.
还有个选择：攀登到高处并寻找人类居住的迹象。
In this place ten miles around there is no signs of human habitation.
在这一地方的十英里的周围内杳无人烟。
Language is human exchange of information system of signs.
语言是人类进行信息交流的符号系统。
But their historical manifestations are signs that also speak clearly to human reason.
不过，它们在历史上的表现，却是清楚地向人类理智所说明的记号。
But their historical manifestations are signs that also speak clearly to human reason.
不过，它们在历史上的表现，却是清楚地向人类理智所说明的记号。
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