That means the...the subject, the primary subject of the photo is sharp and clear.

意思是主体，照片的主体要清晰。

Furthermore, the legal system and the events which occur within it are primary subjects for journalists.

此外，法律体系以及其中发生的事件是新闻记者报道的主题。

Despite the painting's popularity, much ambiguity remains regarding who the painting's primary subject is supposed to be.

尽管这幅画很受欢迎，但关于这幅画的主要主题是谁，仍然有很多模糊之处。