some drifting and slow, others jerky and rapid.
這些活動有的飄忽而緩慢，有的急劇而快速。
新概念英語第四冊
Lesson 19 The stuff of dreams
?? 句中詞匯解析
從本句中提取的重要詞匯
adj. 快速的;[攝]感光快的;險峻的;
n. 急流;高速交通工具，高速交通網;
?? rap-, rav- Rap,rapt,rav=snatch,表示”捕,奪”#詞根助記：搶奪時速度必然很快
"Increased consumption of water has led to rapid depletion of groundwater reserves."
用水量的增加導致了地下水貯備迅速枯竭.
近義：riffle, shoot, stream, quick, accelerated, smart
adj. 慢的;遲鈍的;溫和的;慢于…的;
adv. 慢慢地;緩慢地;
vt.& vi. （使）緩行，（使）減速;
vi. 變慢;變蕭條;
vt. 放慢;阻礙;
?? 速度(s)低(low)即 慢
"an agonizingly slow process"
極其緩慢的過程
近義：brake, decelerate, lagging, leisurely, phlegmatic, poky
反義：speed, hasten, quick, rapid, smart, spanking
jerky
['d??:ki]
adj. 急拉的;忽動忽停的;愚蠢的;呆笨的;
n. 肉干，牛肉干;
"She lit a cigarette with quick , jerky movement."
她用急促的動作點著了香煙.
近義：biltong, charque, charqui, prancing, spasmodic, spastic