521. in the position of 处在位置上
522. in practice 实际上;业务熟练
523. be out of practice 荒疏,不熟练
524. bringinto practice使成为现实
525. preferto 宁要, 更喜欢
526. prepare for breakfast 准备吃早饭 prepare breakfast 作早饭
527. in the presence of 在在场的情况下
528. for the present暂且,就现在来说; at present 现在,此刻
529. preside over at 主持
530. prevail over 占优势, 压倒, 战胜
531. preventfrom 使不, 防止做
532. previous to 在之前
533. take pride in 以自豪
534. pride oneself on upon 以自豪
535. in principle 原则上
536. prior to 在之前
537. in private 私下, 秘密地 in public 公开地
538. proceed from 由发出, 由引起
539. proceed with 继续进行
540. in progress进行中
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Half of cooked meat tested substandard
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Obama vows to pursue nuclear cuts with Russia
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Foreign ambassadors note strength of China's growth
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Taxis get subsidy to soften fuel hike blow
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Wen asks Chongqing to reflect
US may share secret data with Russia
Concerns over radiation remain
Visitors flock to plant despite risk
Sydney Harbour Bridge turns 80
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Women deputies call for greater female voice