Grammar Note
作为名词指国旗、军旗等时，通常以复数形式出现，且常接介词of表示所属。
国旗；旗帜
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国旗；旗帜
a flag that shows its nationality
The flagpole in front of the town hall flies the national colors every day.
市政厅前的旗杆每天升起国旗。
As the warship sailed into port, it lowered its colors to salute the fort.
军舰驶入港口时，降旗向堡垒致敬。
The scout troop proudly displayed its colors at the summer camp opening ceremony.
童子军小队在夏令营开幕式上自豪地展示了队旗。
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作为名词指国旗、军旗等时，通常以复数形式出现，且常接介词of表示所属。
Dictionary facts from ECDICT, WORDNET.