reef
noun
verb
riːf
noun
1
a
line
of
sharp
rocks,
often
made
of
CORAL
,
or
a
raised
area
of
sand
near
the
surface
of
the
sea
礁; 礁脉
a
proposal
to
protect
several
miles
of
thousand-year-old
coral
reef
把这几英里的千年古珊瑚礁保护起来的建议
verb
2
to
tie
up
part
of
a
sail
in
order
to
make
it
smaller
[术语] 缩〔帆〕，收〔帆〕