The speaker was shouted down by a group of protesters.

一群抗议者大叫大嚷，盖过了讲话人的声音。

《牛津词典》

"God is great, " protesters shouted.

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Then two disabled protesters stood up and shouted out.

BBC: Iain Duncan Smith heckled by protesters in Edinburgh

As he arrived, Mr Lansley was shouted at by several protesters waiting by the gates of Downing Street.

BBC: Andrew Lansley heckled by June Hautot in NHS protest