| 摘要 |
A chair is provided, which prevents a user from twisting his/her legs and makes ventilation easily performed. A chair comprises: a buttock part providing the part for sitting down; two separated leg parts; a perineal region in which a groove is formed in the center of the buttock part; a cog wheel connected to the support stand of the buttock part; a cog wheel of two leg parts going in gear with the cog wheel; and a guide connected to two leg parts.
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