公式节点中的运算符和语法同样适用与表达式节点。
The same operators and syntax of the Formula Node apply to the Expression Node.
子表达式运营商。在与布尔运算符用于创建更复杂的表达式。
Subexpression operators. Used in conjunction with boolean operators to create more complex expressions.
按位或向结果表达式添加位，而按位与只选择两个运算符之间相同的位。
Bitwise-or adds bits to the resulting expression, whereas bitwise-and selects only those bits in common between its two operators.
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