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。
By contrast, Americans move, for the most part, voluntarily.
与之相反，美国人搬家大多处于自愿。
The control system USES the PID control, it may voluntarily move according to the input craft when inputting the freezing and drying craft.
控制系统采用PID控制，冻干工艺输入后，可按输入工艺自行运行。
The control system USES the PID control, it may voluntarily move according to the input craft when inputting the freezing and drying craft.
控制系统采用PID控制，冻干工艺输入后，可按输入工艺自行运行。
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