drainage
noun
ˈdreɪnɪdʒ
noun
1
the
process
or
system
by
which
water
or
waste
liquid
flows
away
排水（系统）
A
handful
of
pebbles
in
the
bottom
of
a
flowerpot
will
help
drainage.
在花盆底下放一把鹅卵石能够帮助排水。
a
plan
to
improve
the
town’s
drainage
system
改善城里排水系统的计划