1·Null string variant cannot be converted to a character.
不能将空字符串变量转换为字符。
2·A null string contains zero characters or only Spaces or tabs.
空字符串包含零个字符或只有空格或制表符。
3·To let users select the file to import, specify a null string for filename.
为了让用户选择要导入的文件，文件名指定一个空字符串。
4·However, the.net client de-serializes it into a zero length string instead of a null string.
然而，. NET客户端将其反序列化成长度为0的字符串而不是空的字符串。
5·The CLP recognizes' null '(specified in uppercase characters) as a null string. For example.
CLP将“NULL”(以大写字符指定)识别为空字符串。
6·If a page action method invocation returns a non-null string value, Seam treats it as a navigation event.
如果页面动作方法调用返回一个非空字符串值，则Seam将其当作一个导航事件。
7·Both null and undefined macros expand to null strings, but a macro defined as a null string is considered defined in preprocessing expressions.
空宏和未定义的宏都展开为空字符串，但定义为空字符串的宏被视为是在预处理表达式中定义的。
8·If the string is enclosed in two pairs of double quotes, the first pair is considered to enclose a null string, and the rest of the string is discarded.
如果字符串引号括在双两对，第一对被认为是一个空字符串括起来，而其余的字符串将被丢弃。
9·The default namespace is initialized to be no namespace-URI at all, so there is a syntax for undefining a previously-defined default namespace by assigning it to the null string.
对缺省名称空间初始化，使之完全不是名称空间 URI，这样就存在一个语法，它通过向以前定义的缺省名称空间分配空字符串来取消对该名称空间的定义。
10·I already used this technique above in the split call, which matched the null string (it matches everywhere, so all the characters in the matched string are returned individually).
在split调用中我们就已经使用了这种技术，它可以匹配空字符串(它可以匹配任何地方，因此所匹配的字符串中的所有字符都会一个一个地返回)。