Practice speaking in front of a mirror, repeating words that use M, B, F and P while keeping your eyelids open. In the beginning, speak softly and slowly.

• 在镜子前面联系说话，重复里面有"摸，波，佛，坡"的音，要让你的眼睛睁着。开始的时候要说的慢，说的轻。