其次，我们从前面可以看到，指针可以和整数进行相加或相减运算。
Second, we have already observed that a pointer and an integer may be added or subtracted.
如果将二者输出的电信号相减，可得到跟密度成正比的信号，然后进行乘法与开方运算，即可得到跟质量流量成正比的输出信号。
Substracting two signals can obtain signal proportional to density and after multiplication and evolution operations, an output signal proportional to mass flow can be obtained.
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