GRE

precaution - n. 预防,留心,警戒; :: caution

precedent - n. 先例,前例;

precipice - n. 断崖,绝壁,险境;

precipitant - a. 倒栽葱的,勇往直前的,火急的; n. 沉淀剂;

precipitate - n. 沉淀物; v. 使...陷入,促成,使...沉淀; :: bring about cause give rise to instigate lead to provoke trigger

precipitation - n. 坠落,沉淀,凝结;

precipitous - adj.陡峭的

preclude - v. 预先排除; :: arrest check impede prevent rule out deter

precocity - n. 早熟,早开,早成;

precursor - n. 先驱者,前导,先进者;

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