Originally the word medium has multiple meanings, it refers only to the carrier in the activity of information spreading.

媒介的原来义项较多，后专指信息传播活动中的载体。

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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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Methods: the study included 38 patients suffering from slight and medium chronic pain and limited activity due to degenerative diseases of the musculoskeletal system for longer than 6 months.

方法：选择骨骼肌肉系统慢性疼痛病人38例。所有病人均有轻至中度疼痛及一定程度的关节活动受限，病程均超过6个月。

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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

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

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?