prevent sb from doing sth 阻止某人做某事
prevent to阻止去做某事,表示动作还未发生
prevent from 从某事中阻止,表示动作已经或正在发生
prevent doing sth=prevent from doing sth
prevent sb from doing sth 阻止某人做某事
prevent to阻止去做某事,表示动作还未发生
prevent from 从某事中阻止,表示动作已经或正在发生
prevent doing sth=prevent from doing sth