PDO
target: PHP Data Objects
target: 1,3-丙二醇
description: 1,3-Propanediol
target: 氧化钯
description: PdO
target: 伪微分算子
description: Pseudo-differential operator
target: 原產地名稱保護
description: Protected designation of origin
target: 太平洋十年涛动
description: Pacific Decadal Oscillation