Note that any work that must be done within the user process's context must be done before returning; you will not have access to that context later.
注意：必须在返回前完成任何必须在用户进程上下文中完成的工作，因为随后是不能访问用户进程上下文的。
2
Note that returning data to a non-Unicode client may still introduce substitution characters.
注意，将数据返回到非unicode数据库仍然可能引入替换字符。
3
Predicate (which is the is-factor method I defined earlier in Listing 2 - note the heavy use of first-class functions), returning the Numbers that match.