如果没有指定value子句，则表示没有定义该项的初始值。

If a value clause is not specified, the initial value of the item is undefined.

youdao

如果在sql语句的select子句的XMLQUERY函数中使用xml谓词，则这些谓词不会从结果集中排除任何行，因此不能使用索引。

If you use XML predicates in the XMLQUERY function in the select clause of an SQL statement, these predicates do not eliminate any rows from the result set and therefore cannot use an index.

youdao

但是异常参数t被声明为Throwable，且如果没有修改throws子句，则Throwable不能从foo中抛出。

But the exception parameter t is declared as a Throwable, and Throwable cannot be thrown from foo unless the throws clause is modified.

youdao