名词
中文翻译：信号
同义词：
['flag', 'banner', 'flagpole', 'flagstaff']
例句：
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1.The policeman raised his hand to signal the driver to slow down.
警察举手示意司机减速。
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2. The soldiers waved their flags in a show of solidarity.
士兵们挥舞着他们的旗帜以示团结。
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3.The captain used his flagstaff to direct the fleet.
船长用他的旗杆指挥舰队。