sea level
noun
noun
1
the
average
height
of
the
sea,
used
as
a
standard
for
measuring
other
heights
and
depths,
such
as
the
height
of
a
mountain
海平面
above/below
sea
level
1000m
above
sea
level
海拔 1000 米
changes
in
sea
level
海平面的变化