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Merchant ships salute each other by dipping the flag.
商船互相点旗致敬。
《新英汉大辞典》
This same status is indispensable for captains, pilots, masters, engineers, mechanics, and in general, for all personnel of the crew of any vessel or airship protected by the Mexican merchant flag or insignia.
CENTERFORSECURITYPOLICY: Mexico's Glass House
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