名词
中文翻译：信标
同义词：
['letter of credit', 'letter of intent', 'letter of authorization']
例句：
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1. The captain issueda letter of marque to the crew members.
船长向船员发出了信令。
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2.The company has been granted a letter of marque for its new project.
该公司被授予了新项目的信令。
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3. The government issued a letter of marque to protect the national forests.
政府颁发了信令以保护国家森林。