次一个重要的问题是怎样预知正根，负根和复根的个数。
The next significant question was how to predict the number of positive, negative and complex roots.
我们还有别的解呢，大概在这里,负根号，负的根在那里，而这里也是λ=2。
And we have the other solution 3 which is somewhere here. Negative root three, negative root there. And there, again, lambda equals two.
文中也提出了利用分划曲线来判定系统特征方程具有全部负实部根的方法。
Methods of using the D-decomposition curves to judge whether all the roots of the characteristic equation possess a negative real part are also discussed.
给伤口抽气：研究者希望这种连接一根管子的简易风箱抽气机能够应用到绑着绷带的伤口上，为促进伤口愈合产生足够的负压。
Pumping wounds: Researchers hope that a simple bellows pump attached to a tube that's applied to a wound dressing can generate enough negative pressure to spur healing.
本文引进了一个新的记号，研究色多项式的根全为非负整数的图的色性。
In this paper, a new character is used. When all roots of chromatic polynomials of graphs are not minus integers, the author studies the chromaticity of them.
由实部根轨迹的负与正可以判定系统的稳定性。
The positive part and negative part of the real roots can be used to judge the stability of the system.
由实部根轨迹的负与正可以判定系统的稳定性。
The positive part and negative part of the real roots can be used to judge the stability of the system.
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