A good regulation can use at appropriate table: Want to have 90 centimeters wide, mensal both sides should leave the free space that has 85 centimeters to put chair and cross a body.

• 一条好规则可用于合适的餐桌：要有90厘米宽，餐桌两旁都要留有85厘米的自由空间来放椅子和过身。