v.颠簸( plunge的过去式和过去分词 )；暴跌；骤降；突降 双语释义：v.(动词)vi. 颠簸 thrust its bows into the watervt. 使陷入 put into, put or go suddenly and with forcen.(名词)[S]投入,跳入; 猛冲 an act of plunging, especially head first into water[S]猛跌,骤降 a steep fall英英释义： plungen.a brief swim in w