像中国这样幅员辽阔、历史悠久而又复杂的国家，千百年来必然会形成具有鲜明地方烹饪特色的区域性菜系或帮菜。
With a territory as large and a history as long and complex as China's, it is inevitable that distinct regional differences in cuisine have evolved over the course of centuries.
流域水电开发对国家的社会、经济及环境具有重大影响，科学开发是其必然要求。
The development of cascading hydropower has a great impact on national society, economy and environment, and the scientific development is required.
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