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It's not high mountains and deep valleys that best serve to defend a country.

固国不以山溪之险。

《新英汉大辞典》

First, a lack of competition within the market and the corresponding high cost of SI systems serve to restrain growth.

首先，合成仪器行业缺乏竞争和高昂的维护成本成为遏制市场增长的一个重要因素。

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CLARKSTON, Michigan (CNN) -- A new era in education is dawning in a Detroit suburb, where Clarkston High School may serve as the prototype for high-tech schools of the future.

CNN: Michigan school opens doors for high-tech education

The high steward will serve for 10 years and the sheriff for three.

BBC: East Yorkshire city brings back ancient roles

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