写一篇介绍中西方饮食习惯差异的英语短文

There is another interesting custom in western countries about taking leave of one's host at parties.If guests want to leave,their leaving time should be 10 or 20 minutes after their first saying goodbye.And during this period,guests need to repeat it 2 or 3 times.Guest also need to show their thanks to hosts,and hosts express their hope of reunion.