silent majority

1. N-SING-COLL If you believe that, in society or in a particular group, the opinions of most people are very different from the opinions that are most often heard in public, you can refer to these people as the silent majority. 沉默的大多数; 不公开表达自己意见的大部分人

The silent majority of supportive parents and teachers should make their views known. 表示支持的父母和老师们是沉默的大多数，他们应该公开表达他们的观点。