The default expression calculates a value to assign to the global variable the first time it is referenced.

在第一次引用时，默认表达式将为全局变量计算一个值。

youdao

Indeed, when the XML document USES the default namespace, the XPath expression must use a prefix even though the target document does not.

事实上，如果XML文档使用默认名称空间，那么尽管目标文档没有使用前缀，XPath表达式也必须使用前缀。

youdao

The last one (SqlClientNodes) is initialized to a collection of server objects returned by the expression [tier=app_tier][serverrole=default].

最后一个参数 (SqlClientNodes) 初始化为由表达式 [tier=app_tier][serverrole=default] 返回的服务器对象集合。

youdao

The ease with which his expression resolved into hatred made it clear that anger was his default position.

NEWYORKER: The Visitor