pivotal

adj 1 of or forming a pivot 轴的; 作为旋轴的. 2 (fig 比喻) of great importance because other things depend on it; central （因受其他事物的依附）极重要的, 关键的, 中心的: a pivotal decision 重要的决策.

pithily, pithiness, pithy, pitiable, pitiably, pitiful, pitifully, pitiless, pitilessly, pitilessness, piton, Pitot tube, pitta, pittance, pitter-patter, Pittsburgh, pituitary, pity, pityingly, pivot, pixel, pixie (also pixy), pizza, pizzicato, Pk, pkg, pkt, Pl, pl of vertex., placard, placate, placatory, place, place-bet, place-kick, place-mat, place-name, place-setting, placebo, placement,