容器中的压力保持恒定不变。
而它们中的一些保持恒定不变，因变量按某种自然的方式变化，从而维持约束条件。
Some of them are held fixed, and then some dependent variable does whatever it must so that the constraint keeps holding.
这篇报告描述了某一个人为假定的自然界的基本物理常数，似乎并不是一直保持恒定不变。
The report describes how one of the supposed fundamental constants of Nature appears not to be constant after all.
尼尔森(Nielsen Online)做了很多工作来衡量网络通信的水平，并声称这些数字全年保持恒定不变。
Nielsen Online does a great deal of work in measuring levels of Internet traffic, and has stated that these Numbers have been constant for a full year.
一个是我保持a恒定,那么当然b就会变化，因为这个宽是不变的。,那么当改变θ角时，高度增加了，从而这条边的长度增加了。
One is I keep a constant, and then of course b will have to change because if this width stays the same, then when I change theta, the height increases, and then this side length increases.
另外一种选择就是保持b恒定，改变角度，因此，实际上，这条边长度保持不变。
The other option is to change the angle, keeping b constant. So, actually, this side stays the same length.
就假定保持a恒定不变。
是的，如果你想这样做，也可以用这样的方式改变，那就是保持第三条边恒定不变。
Ah, yes, if you wanted to, indeed, we could also change things in such a way that the third side remains constant.
我们也保持a恒定不变。
结论是：1。驱动轮转数不变时，采煤机的牵引速度保持恒定。驱动轮和销轨的相对速度按正弦函数变化。
Conclusion is made: 1 Traction speed of the shearer keeps constant when the rotation speed of driving wheel is unchanged.
结论是：1。驱动轮转数不变时，采煤机的牵引速度保持恒定。驱动轮和销轨的相对速度按正弦函数变化。
Conclusion is made: 1 Traction speed of the shearer keeps constant when the rotation speed of driving wheel is unchanged.
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