| 摘要 |
A straw adapter 2 is removably disposed in the opening of a beverage container 1 , and a straw 22 is attached to the straw adapter 2 . A straw cap 12 is mounted on the straw adapter 2 , for covering the straw attached to the straw adapter 2 . Operations of the straw cap 12 opens and closes an air hole opening/closing valve 6.
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