| 摘要 |
<p>The cushion can be of a rectangular, round, or cylindrical shape depending on its intended use. It is made of an airtight elastic cover of latex, rubber, or plastic and is provided with a valve for being inflated. The volume can be adjusted to the individual requirements and easily changed gradually by releasing air from the cover or by inserting more air through the valve. The temperature of the air adapts quickly to the temperature of the human body.</p> |
