名词
中文翻译：信号旗
同义词：
['flag', 'signal flag例句：1. The policemanwaved his flag to alert the crowd.（警察挥舞着旗帜来警告人群。）']
例句：
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1. The policemanwaved his flag to alert the crowd.
警察挥舞着旗帜来警告人群。
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2.The flag was flying high in the wind.
旗帜在风中高高飘扬。
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3. Theflag is a symbol of national pride.
国旗是国家自豪的象征。