unit volume expansion
... 单位体积含量 content by volume; 单位体积膨胀 unit volume expansion; 单位网次渔获量 catch per haul; ...
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可膨胀的PFD有较少的体积和没有了干扰泡沫单位，但在想不到的进入水后实时提供漂浮。
An inflatable PFD has less bulk and interference than a foam unit, but is ready to provide flotation during an unexpected entry into the water.
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