Exception handling is a programming language construct designed to handle the occurrence of some condition (exception) that changes the normal flow of execution.
异常处理是一种编程语言构造，旨在处理某些更改常规执行流的情况(异常)。
2
The condition of the other five women has not improved even though they are no longer handling such materials.
其他五位妇女的情况也未得到好转，尽管她们已经不再接触这些材料。
3
If the underlying driver does not support transactions, a PDOException will be thrown (regardless of your error handling Settings: this is always a serious error condition).