A formula derived by the author for calculation of arbitrary three centered arch type headings was introduced here with some modifications made to the conventional design and calculation methods.

介绍了所推导的任意三心拱巷道计算公式，并修正了拱形巷道传统的设计与计算。

youdao

Three new companies are testing out a new kind of social network -centered around (mostly) women's fashion.

有三家新公司正在测试一种新型的社会网络——关注女性时尚信息。

youdao

Most of the research centered on rice, an important crop in those three West African countries.

大部分研究集中在大米方面，大米是这三个西非国家的重要农作物。

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The conference centered on three main problems to getting and keeping girls in school: violence,poverty and poor quality education.

VOA: special.2010.05.20

Most of the research centered on rice, an important crop in those three West African countries.

VOA: special.2010.03.23

When the area was part of the Ottoman Empire prior to World War One, it was three separate provinces centered on Baghdad, Basra and Mosul, in recognition of its ethnic diversity.

FORBES: Iraq: The Biggest Mistake In American Military History

This is notable because the 1990s marked the period when both US and Israeli foreign policies centered on repeated attempts to appease all three governments.

CENTERFORSECURITYPOLICY: Recognizing the Axis of Evil

This evidence based program has tracked results through Vanderbilt University for three years and has seen, not just person-centered change but also community-centered change led by the 270 graduate families of Tied Together.

WHITEHOUSE: Helping to Provide a Healthy Start for Children