If you refer to a cascade of something, you mean that there is a large amount of it.
例句
The women have lustrous cascades of black hair...那些女子拥有瀑布般乌黑亮泽的秀发。A cascade of mail arrived from friends.朋友寄来的邮件如雪片一般。
N-COUNT
瀑布
A cascade is a waterfall.
VERB
(水)飞流直下，倾泻而下
If water cascades somewhere, it pours or flows downwards very fast and in large quantities.
例句
She hung on as the freezing, rushing water cascaded past her...她抓得紧紧的，任凭冰冷湍急的水流从她身上倾泻而下。A waterfall cascades down the cliff from the hills behind.一处瀑布从身后山崖上飞流直下。
VERB
垂落;悬挂
If one thing cascades over another, it falls or hangs over it.
例句
Vivid red and pink geraniums cascade over my balcony...鲜艳的红色和粉色的天竺葵从我家的阳台上直挂下去。From her tiny waist a crinolined skirt cascaded in three deep tiers.裙架撑起的三层大裥裙从她的纤腰上款款垂下。