The sheer size of the service is at the heart of many complaints, such as long waiting times, canceled operations and poor nursing care.

VOA: standard.2009.09.24

So I like the fact that the legal industry is at heart a service industry.

我喜欢法律是服务业的核心这个事实。

为什么来到法学院？ - SpeakingMax英语口语达人