101. preface to ……的前言 如：

an essay written as a preface to a more detailed work
作为更为详细的作品的序言而写的文章

102. preparation for 准备  如：

They have made good preparation for the upcoming elections.
他们对即将到来的选举作了充分的准备。

103. preference to sth 优先  如：

In considering people for jobs, we give preference to those with some experience.
对于求职者，我们优先考虑有一定经验的人。

104. proposal for sth 建议  如：

I reflected on this proposal for some time.
这项建议我仔细想了一些时候。

105. prejudice against 对……的偏见  如：

He has a prejudice against all foreigners.
他对所有的外国人都有偏见。

106. protection for sb 保护  如：

environmental protection for exploration engineering
探矿工程环境保护

107. protest against sth 抗议  如：　

The Russian team entered a protest against the tactics of American side.
俄罗斯队提出正式抗议，反对美国队的战术。

108. ratio of sth to sth 比率  如：

The ratios of 1 to 5 and 20 to 100 are the same.
1与5之比和20与100之比相同。

109. reaction to 对……的反应  如：

a negative reaction to the new advertising campaign
对新广告的宣传手法持反对立场

110. reason for 原因，理由 如：

Their reason for doing it is still a puzzle to me.
他们为什么要做此事我仍莫名其妙。