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Is it hinder friend is it perplex to feel often at loading water with to depend on.
The products are added the buoyancy to with the concept of the seesaw.
It will just have movements warned that will tell that look at the persons who hinder that full for water.
Solve the problem that look at the persons who hinder and put water once coming like this.
She-Te-University
Kaohsiung County, Taiwan
Chun-Tung Chen
She-Te-University
Kaohsiung County, Taiwan
Hui-Ju Shih
Pei-Hsin Wang