It's hard for the non-fashion-maven to tell a more expensive suit from a less expensive one, a high-quality shirt from a medium-quality one, and so on.

非时尚专家很难判别出两套正装的价格高低，或者优质和中等的衬衫。

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All large and medium-sized Chinese cities will have greater air quality monitoring by 2010, says a government official.

一位政府官员表示，到2010年，中国所有大中型城市的空气质量监测都将得到加强。

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This cloth is of medium quality.

这布是中等质地的。

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SanDisk's new distribution channel addresses a wider portion of the market by delivering high-quality SanDisk SSD technology to small and medium-sized businesses, a growing market segment for SSDs.

ENGADGET: SanDisk releases Ultra Plus and X110 SSDs with speed on a budget

For example, shows can be watched in one of four video-quality levels (low, medium, high or auto), but people might not know what their network is capable of playing.

WSJ: For Live TV on the Go, Aereo Is Impressive But Limited