| 摘要 |
A seat cushion includes two hollow bodies, an inner hollow body of generally a round shape and an outer hollow body surrounding the inner hollow body and of generally a toroid or donut-like shape. The inner hollow body has a gas inlet and a liquid inlet, whereas the outer hollow body has a gas inlet. When filled with a gas, generally air, the outer hollow body forms a firm boundary around the seat cushion to provide a sitter with better sitting stability. When filled with a gas and a liquid, generally air and water, the inner hollow body has free spaces therein for generating liquid surface wave motion and thus is capable of providing a massage effect.
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