recognized, familiar, or within the scope of knowledge 已知的,熟悉的,认识的 plants little known to western science. 西方科学不太了解的植物。 the known world. 已知世界。 ■[attrib.]publicly acknowledged to be 公认的 a known criminal. 公认的罪犯。 ■(Mathematics)(of a quantity or variable) having a value that can be stated (数)(数量,变量)已知的