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笔记本
indicator boards是indicator board的复数
indicator board
美
英
un.
指示表板;布告栏
复数:
indicator boards
单数:
indicator panel
复数:
indicator panels
英英
n.
1.
a
large
board
with
letters
or
words
on
moving
parts
,
used
at
stations
and
airports
to
show
when
trains
and
flights
are
arriving
or
leaving