concern的用法和短语

1.The new legislation concerns health and safety at work.这项新法规涉及工作场所的健康与安全。

2.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。

3.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。