放开嗓音
to sing or speak loudly and clearly
It's a big theatre so you really have to project your voice if you're going to be heard at the back. 这是一个大剧院，所以如果你想让后排的人听见就必须放开你的喉咙。
Teachers need to be able to project their voice.
There was a large crowd and he had trouble projecting his voice.
I really try to project my voice so that everyone can hear me.
He had always had problems with his vocal cords, but they went away once he took voice lessons and learned how to properly and safely project his voice while on stage.
See also: project verb (THROW)