Once the hermetic package is opened and the "hibernated" grains are exposed to the air, they gradually release carbon dioxide gas, and almost all the absorbed carbon dioxide gas can be retrieved within 24 hours.
(the hermetic package; is opened; ) (the "hibernated" grains; are exposed; to the air) (they; gradually release; carbon dioxide gas) (almost all the absorbed carbon dioxide gas; can be retrieved; T:within 24 hours)
the hermetic package the "hibernated" grains they almost all the absorbed carbon dioxide gas
is opened are exposed gradually release can be retrieved
to the air
carbon dioxide gas
T:within 24 hours