p b meaning in Chinese

三个双唇音之一拼作
则拼作

Vander h r r w j , soeters p b . glutamine and the preservation of gut integrity [ j ] . lancet , 1993 , 341 : 1363
彭淑梅,王淑珍,高薇薇,等.西沙比利治疗危重症并胃肠功能衰竭的临床探讨[ j ] .临床儿科杂志, 2002 , 20 : 343 - 345
Still picture display i p b freezes an image to allow for precise picture quality adjustment auto switching field frame still for added versatility
精画图像技术，亮度色度对比度饱和度锐利度和gama校正效果分档分量调整