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海滨救生员通常用旗号传达信息。
The beach life-guards usually flag one another for communication.
youdao
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海滨救生员通经日常旗号传达讯息。
The beach life-guards applying flag one anotIT for communication.
youdao
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海滨救生员通经日常旗号传达讯息。
The beach life-guards applying flag one anotIT for communication.
youdao