| 摘要 |
The variable-volume bottle is in three parts permanently secured together by joints impervious to air or liq., by welding or gluing etc. - The top part is rigid and contains the mouth and cap. The bottom part incorporates the base and is likewise rigid, while the middle part is of corrugated plastic impervious to air or liq. All parts are inert to the liq. and or the dissolved gases contained by the bottle. The middle part can be extended or contracted to vary the volume.
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