当物理内存已经不够用的时候，计算机将会将那些暂时不用的数据放到计算机硬盘上。它的作用与物理内存基本相似，要降低PF使用率最好的办法是增加内存。
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以上来源于: WordNet
the INTERNET DOMAIN NAME for French Polynesia 法属波利尼西亚
PF: We firstly focus on consistency and lean-ness.
PF：一致性和轻便性是我们的首要关注点。
Pf : Probability that a piece of space junk will survive reentry.
Pf：指一块太空垃圾坠落到地球表面的概率。
PF: at the moment we don't have any agnostic API for data other than JDBC.
PF：目前，除了JDBC，我们还没有任何平台无关的数据api。
Like many Zimbabweans he fears that ZANU-PF will resume its campaign of violence if and when any elections are scheduled.
VOA: standard.2009.09.15
Mr.Tsvangirai, who became prime minister in the new government, called for reconciliation between ZANU-PF and his Movement for Democratic Change.
VOA: standard.2009.09.15
Mr.Reinfeldt underscored that the sanctions are primarily travel restrictions and a freeze of foreign assets of senior ZANU-PF officials.
VOA: standard.2009.09.12
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