他说话的声音很大，连隔壁屋子里的人都听得见。

So loudly did he speak that even the people in the next room could hear him.

youdao

他认为，对于很小的孩子来说，思考就是大声地跟自己说话，因为小孩即便是自言自语时声音也很大。

He argued that for very young children, thinking is really talking out loud to oneself because they talk out loud even if they're not trying to communicate with someone in particular.

youdao

他说话或咳嗽时经常发出很大的声音。

He often made big noises when he talked or coughed.

youdao