arc
noun
ɑːk
noun
1
a
curved
shape
or
line
弧（状）
the
arc
of
a
rainbow
彩虹的弧状
2
part
of
a
curved
line
or
a
circle
弧线; 弧形
The
sun
moves
across
the
sky
in
an
arc.
太阳在天空中以弧线方式运行。
3
a
flash
of
light
formed
by
the
flow
of
electricity
between
two
points
弧光，电弧