The disadvantages are that you have to pay for them, they have a steep learning curve, and they don't allow you access to their source code in case you need to modify a feature.
而缺点是您需要为它们付费，有一段陡峭的学习曲线，而且当您需要修改功能时不允许您访问源代码。
Even, its control system commonly consists of simulation instrument, can't modify the changing surge curve of compressor in time and can't control nonlinear surge curve preferably.
且控制系统一般采用模拟仪表构成，在压缩机的喘振线发生变化时不能及时修正，对非线性的喘振线不能较好的实施控制。
This line, called a cotangent line, is used by the system to modify the curve.
这条线叫做共切线，是系统用来改变曲线形状的。
This line, called a cotangent line, is used by the system to modify the curve.
这条线叫做共切线，是系统用来改变曲线形状的。
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