A circle-like criterion will be given it says that some frequency-domain conditions of all vertex or edge systems guarantee the absolute stability of the whole uncertain system.

我们将给出一个类似的圆判据，它说，所有顶点或边系统的某些频域条件可保证整个不确定系统是绝对稳定的。

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Metropolitan coordinating region (MCR) is an important form of regional spatial structure, where intensive relation between core city and other cities inside shape a circle-like structure.

都市圈是高度城市化地区空间组织的一种重要形式，其核心城市与内部其它城市的高强度联系塑造了圈层状的地域结构特征。

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You are probably aware that the earth's orbit around the sun is not shaped like a perfect circle.

你可能知道，地球围绕太阳的轨道形状不像一个完美的圆。

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And some of the graves were marked by nothing more than gray, worn down rocks that poked up in a semi-circle like neglected, decaying teeth.

NPR: Excerpt: 'The Garden Angel'

An even bolder option would be to encourage private providers like the Circle health-care group, which took over the failing Hinchingbrooke hospital in Cambridge this year, or try to attract outsiders like Helios, a German company which specialises in improving badly managed health-care facilities, to compete for control of the weaker English hospital trusts.

ECONOMIST: Hospital takeovers

So I started writing more, I built my website inch by inch, row by row, I connected with like-minded people, I expanded my circle of contacts and my mind.

FORBES: When You Hit a Wall, Move Around It