This formula is used to calculate the area of a circle.

这个公式用于计算圆的面积。

《牛津词典》

A spotlight lights up only one section of a stage; similarly, "spotsound" creates a circle of sound in on targeted area.

聚光灯只能照亮舞台的一部分；同样，“定点音效”也能把声音投射到指定的区域。

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This is beneficial when the dataset is large and the frequency of queries that request the area of a circle is high.

如果数据集较大，或者经常发出请求圆面积的查询，那么创建函数索引将有助于提高性能。

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France is a country with many obvious problems, but in the area of food, it has excelled in creating a virtuous circle of people who love making food and people who appreciate food that is well made.

FORBES: Radical Management In France: The Quest For Heavenly Bread

His family said he was well-known around the area and had a big circle of friends who were "absolutely devastated" by his sudden death.

BBC: Tribute to Cumbria crash driver Billy Parker

When I would walk outside on a winter's day in Fairbanks, a mere 125 miles from the Arctic Circle, I would divert my breath up to my eyes (the only exposed area of my body) to keep them from freezing shut.

BBC: This is Snow & Skiing week