在第二个实施例中，袋上设置有向外的折叠，当它与包含有将被吸取物体的腔体接触时，形成环形腔体。
In a second embodiment, the bag is provided with an outward fold, forming an annular cavity upon contact with the cavity containing the element to be extracted.
在第二个实施例中，袋上设置有向外的折叠，当它与包含有将被吸取物体的腔体接触时，形成环形腔体。
In a second embodiment, the bag is provided with an outward fold, forming an annular cavity upon contact with the cavity containing the element to be extracted.
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