1.progression n．进展(advance)；级数(a sequence o related to its predecessor by a uniform law)
例：geometric progression几何级数，筹比级数

2.progressive a．上进的(advancing)；【医】愈来愈严重的(increasing in severity)

词根记忆：来自progress(n．进步)
例：The ideal of "openness" has made Americans a progressive people.// The value of a treatment for a progressive disease may vary according to a patient's stage of disease.
派生词：progressively( ad.逐渐地，逐步地)

3.prohibit v．禁止（to forbid by authority）；阻止(to prevent from doing sth.)

词根记忆：pro(提前)+hibit(拿住)--提前拿住--禁止；阻止
例：Fishing regulations prohibit people from keeping any salmon they have caught in Lake Paqua.
派生词：prohibition(n．禁止；禁令)
同根词：inhibit(v.禁止)

4.project n．工程：计划(scheme)；v.预计( to plan, figure, or estimate for the future)

词根记忆：pro(提前)+ject(扔)--提前扔出来--预计
例：Aviation fuel is projected to decline in price over the next several years.

5.projection n．预测；规划(scheme)

词根记忆：pro(提前)+ject(扔)+ion--提前扔出来--规划：预测
例：Weather forecasters make some use of computer projections to identify weather patterns.

6.prokaryote n.原核生物(any of the typically unicellular microorganisms that lack a distinct nucleus and membrane bound organelles)

派生词：prokaryotic(a.原核的)