As major players in economic activities and technological innovation, enterprises are obviously under pressure from competition.
企业作为经济活动和技术创新的主体，面临的竞争压力不言而喻。
The reasons leading to the degeneration of aquatic ecosystem are various and the mismanagement of human economic activities is the major factor.
导致水生态系统退化的原因多种多样，而人类经济活动的不当是主要的作用因子。
The economic activities of these three major economic agents make up the micro-base of macroeconomic operation.
这三大经济主体的经济行为活动构成了宏观经济运行的微观基础。
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