| 摘要 |
<p>A container is formed of a vessel, an air pump, a pressure triggering switch, and a battery set. The vessel is formed of a cylindrical main body and a lid for covering the open top of a receiving cell of the vessel. The air pump, the pressure triggering switch, and battery set are disposed in the lid for keeping the air pressure in the receiving cell at a desired level. When the air pressure in the receiving cell is so changed as to be higher than the desired level, the air pump is activated by the pressure triggering switch to draw the excess air out of the receiving cell until the air pressure in the receiving cell is equal to the desired level. The air pump is then automatically deactivated by the pressure triggering switch.</p> |
