The show had to be taken off because of poor audiences. 因观众太少而取消演出。

She has addressed audiences all over the country. 她曾向全国各地的听众演讲。

另外，audience作为集合名词，原则上不能用它表示个体，但every audience是例外，当要强调每一名观众时，可以这样用。如：

The pianist made a conquest of every audience for which she played. 这位钢琴家以她的演奏征服了每一位听众。

3. 形容听(观)众人数之多或少，通常用big, large, huge, mass, vast, wide 以及small, thin等形容词修饰，但是不用many, few修饰。如：

There was a large audience of young people at the pop concert. 流行音乐演奏会上有大量青年听众。

Her lecture had a crowded audience. 她的演讲挤满了听众。

The speaker had a small (thin) but attentive audience. 这位演讲者的听众不多(很少)，但很专心。(from www.liuxuepaper.com)

She felt nervous at having to sing before so large an audience [such a large audience]. 要在那么多观众面前唱歌她感到很紧张。

4.要具体表示观众的数量liuxuepaper.com