| 摘要 |
A respiratory exercise device for measuring the volume of air inhaled by the user, the device comprising an essentially rigid transparent container having an inhalation tube by means of which air is evacuated from the container, the container having an expansible member in communication with the outside air which expands within the container as the air in the container is evacuated, calibrated indicia being provided which measures the extent to which the expansible member is expanded, thereby indicating the volume of air withdrawn from the container.
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