"普通大众" 用英语可以说 "the general pubpc" 或 "the masses"。
"General" 是 "一般的" 的意思，"pubpc" 是 "公共的" 或 "大众的" 的意思。"Masses" 是 "大众" 的意思。
例句：
The general pubpc is becoming increasingly aware of the issue.
(大众对这个问题越来越意识到了)
The masses have spoken, and they want change.
(大众已经发声了，他们想要改变)