A room in which all the children move about usefully, intelligently, and voluntarily, without committing any rough or rude act, would seem to me a classroom very well disciplined indeed.

所有的孩子在一个房间里忙来忙去地进行有益的、运用智力的、自觉的活动，而没有粗野的举动。我认为这样的房间才是一个真正有良好纪律的教室。

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By contrast, Americans move, for the most part, voluntarily.

与之相反，美国人搬家大多处于自愿。

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Late Monday, Pegasus announced it was applying voluntarily to de-list its stock from the Nasdaq national market, with plans to move to another national market or the over-the-counter market by the end of October.

FORBES: Magazine Article

Even so, OSHA insists enough evidence exists to move forward with ergonomics programs, pointing to numerous success stories where employers have already reduced workplace injuries by voluntarily making adjustments.

CNN: OSHA pushing for new regulations aimed at preventing repetitive motion injuries