It may rain tonight so take an umbrella as a precaution.今天晚上可能会下雨，因此预防起见，还是带一把伞吧。

precede vt.在…之前，早于

Last year’s heavy rainfall preceded this year’s good harvest.去年的大雨决定了今年的好收成。

precious 办宝贵的，珍贵的

Diamonds, rubies, and emeralds are precious stones.红宝石和祖母绿都是宝石。

precise adj.精确的，准确的

The directions they gave were so precise that we found our way easily.他们给出的方向指示非常准确，我们很容易就找到了路。

predict vt.预言，预告

Although the weatherman had predicted snow, it was a beautiful weekend.虽然天气预报说有雪，但周末却是好天气。

preface vt.序言；开端

The lecturer stated her main idea in the preface of her speech.演讲人在开场场白中陈述了自己的主要观点。

preiudice n.偏见

The new immigrants faced much preiudice.新移民面临许多歧视。

preliminary adj.预备的，初步的

The professor expects a preliminary draft of the paper two weeks before the final due date.教授希金在最终故止日期的两周前收到论文的初稿。

prescribe vt.①指示，规定②开药方

The company president prescribed a new business plan for his employees.公司总裁为员工制定了一个新的业务方案。

The doctor prescribed penicillin.医生开了青霉素。

presently adv.现在，当前

Anne is presently busy and cannot come to the telephone.安妮目前很忙，没法来接电话。