It would have been better to allow multiple instances of logging and exception-handling classes.

如果允许日志记录和异常处理类有多个实例则会更好。

youdao

Even if they allow multiple physically distributed instances of services, there is one abstract definition for each — managed by the organization as a whole — and a common implementation.

即使它们允许存在多个物理分布的服务实例，但是每个实例都只有一个抽象定义(由组织统一管理)和一个公共实现。

youdao

This schema will allow instances to be created with multiple submissions populating a separate data model.

该模式将允许创建使用多重提交填充单独数据模型的实例。

youdao