descend 通常指沿斜线或斜坡下降。
drop 指物体从一定高度落下。
fall 与drop同义，指突然或猛烈地降落，但fall也可指任何下落，同高度或形式无关。
sink 指在空气或水中垂直下降、下沉。
参考例句
1. Water dropped from the ceiling into the pan on the floor. 水从天花板滴落到地板上的盆子里。
2. Could you drop us off on that corner? 您能让我们在那个角落处下车吗？
3. How much dew would a dewdropdrop if a dewdrop could drop dew? 一颗露水能滴下多少露珠呢如果它能滴下露珠的话？？
英英解释
n.
1. a small indefinite quantity (especially of a liquid)
2. a shape that is spherical and small
3. a sudden sharp decrease in some quantity
4. a steep high face of rock
5. a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or sto
6. a free and rapid descent by the force of gravity
7. a curtain that can be lowered and raised onto a stage from the flies; often used as background scene
8. a central depository where things can be left or picked up
9. the act of dropping something v.
1. let fall to the ground
2. to fall vertically
3. go down in value
4. fall or drop to a lower place or level
5. terminate an association with
6. utter casually
7. stop pursuing or acting
8. leave or unload, especially of passengers or cargo
9. cause to fall by or as if by delivering a blow
10. lose (a game)
11. pay out
12. lower the pitch of (musical notes)
13. hang freely
14. stop associating with
15. let or cause to fall in drops
16. get rid of
17. leave undone or leave out
18. change from one level to another
19. grow worse
20. give birth; used for animals
