Hold Shift and drag to draw a perfect circle.

按住Shift键并拖动以绘制一个完美的圆形。

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You might have to hold the Shift key or something like that, but they're standard keys.

你可能要按住Shift键或什么键，但他们是标准键。

哈佛公开课 - 计算机科学课程节选

Tap and hold shift while you drag to select chunks of text.

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But Blair is likely to hold firm against moves to shift responsibility for European defense away from NATO and the influence of the United States.

CNN: Europe, world react to Blair victory

Networks, film companies and other entertainment powerhouses that hold the rights to content, though concerned about a coming shift in how viewers see shows and events, hold more cards than the music industry did when Steve Jobs negotiated with record label executives.

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