扫码下载
诗词在线APP
安卓与 iPhone 都可使用
PR
['pi 'ɑr]
- abbr. 公共关系（public relations）；性能要求（Performance Requirement）
英英释意
- 1. a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process