为可空类型提供类库支持，包括转换运算符和算术运算符。
Library Support for nullable types, including conversion operators and arithmetic operators.
只能使用四个二元算术运算符(加、减、乘、除)。
Only the four usual binary arithmetic operations (addition, subtraction, multiplication and division) are allowed.
只要没有混合的类型表达式，就可以在常数说明中使用算术运算符。
You can use arithmetic operators within your constant declarations as long as there are no mixed type expressions.
对于数可使用标准算术运算符，对于组合字符串可使用串联运算符。
Use standard arithmetic operators for Numbers and a concatenation operator for combining strings.
例如，将算术运算符(如+)施加于某个元素时，该运算符会自动提取该元素的数值。
For example, arithmetic operators such as +, when applied to an element, automatically extract the numeric value of the element.
表达式节点支持包含算术和布尔(真或假逻辑)运算符的简单表达式。
Expression nodes support simple expressions involving arithmetic and Boolean (true or false logic) operators.
提供了很多新的函数和运算符在时间点和时期之间完成适当的算术运算。
Many new functions and operators are provided that allow all suitable arithmetic operations between points in time and durations.
使用运算符可以执行算术、比较、串联或赋值操作。
Operators allow you to perform arithmetic, comparison, concatenation, or assignment of values.
使用运算符可以执行算术、比较、串联或赋值操作。
Operators allow you to perform arithmetic, comparison, concatenation, or assignment of values.
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