他们假设，语言多样性一定与历史、文化差异、山脉或海洋分隔人口有关。
They hypothesized that language diversity must be about history, cultural differences, mountains or oceans dividing populations.
他们假设，语言多样性一定与历史、文化差异、山脉或海洋分隔人口有关。
They hypothesize that language diversity must be about history, cultural differences, mountains or oceans dividing populations.
美国对其它国家历史、语言与文化的无知，是很危险的。
America is dangerously uninformed about other country's history, language and cultures.
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