The inputs and outputs are either unknown or loosely defined, the transformation process lacks necessary precision, and quality control is not defined.
输入输出都是未知的或仅仅初略定义的，过程转换缺少必要的精确性，并且质量控制也是未定义的。
2
The system with unknown input is translated into an equivalent system without unknown input by a simple algebraic transformation.
通过一个简单有效的代数变换，将具有未知输入的系统变换成一个不含未知输入的等价系统；
3
Transformation shifts your energies so much that rather than feeling free, you have the sense of being without a foundation, of being stranded in a sea of the unknown.