I find it difficult to be objective where he's concerned.
只要涉及他，我就难以做到保持客观。
Our main concern is to provide quality customer service.
我们最关心的.是为顾客提供优质服务。
These, then, are the main areas of concern.
总之，这些是人们主要关注的方面。
The new regulations will be of benefit to everyone concerned.
新规章将使所有有关人员受益。