向下, 在下面
from a higher to a lower point of something
沿着, 顺着
along (a river or road) toward the sea or a main center
to a lower place or position
下降, 沮丧
in or into a lower or worse position, state, or condition
向下, 下行
directed or moving toward a lower place or position
沮丧, 低落
unhappy or depressed
绒毛, 软毛
soft, fine feathers or hair
击倒, 使倒下
to defeat or cause to fall