There was no escort vessel so he was all alone.
UNIDENTIFIED MALE: Go Pro cameras documented his days and nights at sea.Go Pro 摄像机记录了他在海上的日日夜夜。没有护航船只，所以只有他一个人。
Escort vessel
原声例句
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Kaibōkan
Kaibōkan(海防艦, "sea defence ship") or coastal defense ship refers to a type of naval ship used by the Imperial Japanese Navy during World War II for escort duty and coastal defense. The term escort ship is used by the United States Navy to describe this category of Japanese ships.
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