It would be the first time in human history that economic necessity has prevailed over military aggrandizement.
经济需要压过了军事扩张，这将是人类有史以来的第一次。
The use of campfires, once a necessity for cooking and warmth, is steeped in history and tradition.
营火的运用，曾经是野外作饭和取暖的必要条件，在历史和传统上有过很多重要的记载。
This text discuss the importance and necessity that the multimedia is in the history teaching first.
本文首先论述了多媒体在历史教学的重要性和必要性。
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