1.preoccupation n．先入之见(something that engages the interest or attention beforehand or preferentially);n．入神(extreme or excessive concern with something)

词根记忆：pre(先)+occupation(占据)——预先占据——先入之见

例：The historian who writes the record of the past inevitably reflects the preoccupations of his own time.

2.prepay v.预先支付（某费用）(o pay in advance)

例：A newly instituted program will allow parents to prepay their children's future college tuition at current rates.

3.preponderance n.（压倒性）优势：多数（majority）

联想记忆：pre(前面)+ponder(重量)+ance——重量排名靠前——优势：多数

例：The enemy have a marked preponderance in the air.

4.prerequisite n．先决（必备）条件，前提(required as a condition for sth. to happen or exist)

词根记忆：pre(预先)+requisite(要求)——预先要求——先决条件

例：A degree is an essential prerequisite for employment at this level.

5.prescribe v.开（药），开处方(to write, give or order the use of, esp. medicine, remedy, etc.)

词根记忆：pre(预先)+scribe(写)——预先写好——开处方

例：Physicians have the final say as to whether to prescribe a medication for a patient.

派生词：prescription(n．处方)

6.prescription n．药方(a written direction for a therapeutic or corrective agent);指示(the action of laying down authoritative rules or directions);惯例( convention)

词根记忆：来自prescribe(v.开处方)

例：A proposed law would allow general advertising of prescription medications.

同根词：prescriptive(a．规定的，指定的)

7.presentation n.报告；陈述(something presented)

词根记忆：来自present(v.介绍)

例：At the stockholders meeting, investors heard a presentation on the numerous challenges the company faced.

8.preservation n．保存，保留(of or relating to protecting or maintaining）

词根记忆：来自preserve(V．保护，保存)

例：That is exactly why a more sensible preservation strategy would be to assist the farmers to modernize their farms to the extent needed to maintain viability.

9.preservative a．防腐的(having the power of preserving)；n．防腐剂(an additive used to protect against decay)

词根记忆：pre(预先)+serv(保持)+ative(……的)——预先用来保存的——防腐的

例：These wine makers have been able to duplicate the preservative effect produced by adding sulfites by means that do not involve adding any potentially allergenic substances to their wine.