一元操作符负号和二元操作符减号的区别是什么？
What is the difference between the unary minus operator and the binary subtraction operator?
元程序设计系统是一种以程序作为操作对象的有效的程序设计工具，并具有广泛的应用。
Metaprogramming system is an efficient design tool which operates to program and has many applications.
“一元运算符”是一种对单个操作数进行运算的运算符。
A unary operator is an operator that operates on a single operand.
在数据仓库环境中，元数据互操作性是一个关键问题。
Metadata interoperability is a key problem in data warehouse environment.
整个路线步骤短，操作简单，是合成呋甾皂苷元的较理想方法。
Therefore, this short and simple route was an ideal method to synthesize aglycone.
注意使用三元的操作。
注意使用三元的操作。
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