If a logical expression is hard to understand, try transforming it.
如果一个表达式的逻辑不容易理解，则需要试着改变其形式。
As mentioned, expression nodes also support simple arithmetic and logical expressions.
如前面所述，表达式节点还支持简单的算术和逻辑表达式。
In the design of logical circuit, the simpler the logical expression is, the more economical is the realization of the circuit.
在逻辑线路的设计中，逻辑表达式越简单，线路实现时就越经济。
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