Is a single witness sufficient to uphold a judgment?

or any other witness while accepting or believing other portions of his testimony." (People v. Langley (1974) 41 Cal.App.3d 339, 348.) "Moreover, the testimony of a single witness is sufficient to uphold a judgment even if it is contradicted by other evidence, inconsistent or false as to other portions." (People v. Leigh (1985) 168 Cal.App.3d 217, 221.)