尽管科学取得了很大的进步，但是我们对生态系统运行机制的了解还刚刚起步。
In spite of all our scientific advances, we are only just beginning to understand how ecosystems work.
本研究首先系统的描述了国际食糖市场的运行机制与各个国家的糖业政策。
At first, the dissertation systematically describes the operating mechanism of the international sugar market and each national sugar policy.
它是以商业文化系统中各构成要素的关系、结构及其整体运行机制为研究对象。
Its research object is involved in the relationship among all the factors, their structure and the whole working mechanism in the commercial system of culture.
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