Then, this paper deeply investigated the three difficult problems of the system, such as exception handling, security right controlling and heterogeneous database access.

然后，就系统的三个难点问题——异常处理、安全权限控制和异构数据库访问进行了深入的研究。

youdao

Then, this paper deeply investigated the three difficult problems of the system, such as exception handling, security right controlling and heterogeneous database access.

然后，就系统的三个难点问题——异常处理、安全权限控制和异构数据库访问进行了深入的研究。

youdao