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If you feel trouble to carry a drinking bottle when doing exercise,
then you can put on outdoors belt,outdoors belt is convenient
and also can absorb sunlight through solar panels, and
the energy will provide the lights when you doing exercise at night,
in order to prevent you from car accident or hurt.
Kaohsiung Normal University
Taoyuan County, Taiwan
chih fa Hsu 許智發 ming yi Shen 沈旻毅