529. preside over / at 主持(会议,业务等)
530. prevail over 占优势, 压倒, 战胜
531. prevent…from 使…不, 防止…做
532. previous to (=prior to) 在…之前
533. take pride in(=pride oneself on) 以…自豪
534. pride oneself on / upon 以…自豪
535. in principle (=only in regard to the main idea) 原则上
536. prior to (=before) 在…之前
537. in private (=privately) 私下, 秘密地; in public 公开地
538. proceed from (=arise from, result from) 由…发出, 由…引起(产生)
539. proceed with ( =begin and continue sth.) 继续进行
540. in progress(=in the state of be done)进行中
541. prohibit…from (=forbid) 禁止, 阻止
542. in proportion to 与…成比例
543. protect…from 阻止..不受,保护不受
544. be proud of 为…自豪
545. provide for 为…做准备
546. in public 公开地, 当众
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