plunge move quickly， suddenly and with force
poise be ready， be balanced， self-possession
ponderous heavy， bulky， dull
posture state， attitude； adopt a vain
poverty state of being poor
precept moral instruction
precipitate throw smth violently down from a height
precursory peliminary， anticipating
predilection special liking， mental preference
preempt obtain by preemption or in advance
premature doing or happening smth before the right time
presage warning sign
pristine primitive
procrastination keeping on putting off
prodigious enormous， wonderful