| 摘要 |
A lid including a positionable stopper nested inside an upper body that is nested inside a lower body. A user applies a rotational force to the upper body, which rotates about an axis of rotation relative to the lower body to translate the rotational movement of the upper body into linear movement of the stopper along the axis of rotation. The stopper is configured to move axially along the axis of rotation relative to the upper body toward and away from the vessel based upon the direction in which the upper body is rotated. When the stopper is farthest from the vessel along the axis of rotation, the stopper abuts the upper body and seals the liquid inside the vessel. When the stopper is sufficiently near the vessel, an opening is defined between the stopper and the upper body through which the contents of the vessel may exit.
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