As an unique social activity of human being, it includes subject, object and medium.

作为人类特有的社会活动，它包含主体、客体和中介三个要素。

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The activity of lactic dehydrogenase in the tissue culture medium was measured by a LDH kit.

使用乳酸脱氢酶试剂盒，测量组织培养液中乳酸脱氢酶活性的动态变化。

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Objective: To find out a method of extraction and purification of bone morphogenetic protein (BMP) from osteosarcoma cell conditioned medium, and evaluate the biological activity of BMP.

目的探索从骨肉瘤细胞条件培养基中提取骨形态蛋白（BMP）的方法，并测定其生物学活性。

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Therefore, our policy stance must be determined in light of the medium-term forecast for real activity and inflation, as well as the risks to that forecast.

NPR: Economic Swoon to Continue, Bernanke Says

Financial-statement-analysis-of-small-businesses Manta, an online directory and network for small and medium businesses, this week said new business activity in the third quarter was up 12 percent from a year earlier.

FORBES: Are things getting better for small business?

That change in trend was reinforced by the slowdown in takeover activity, which had tended to be focused on small and medium-sized companies.

ECONOMIST: Looking for growth stocks when there is not much growth