To examine the relationship between gratuities and opinion , researchers asked 20 art experts and 20 non-experts to view a series of paintings .
为检验“小恩小惠”与舆论之间的联系，研究人员邀请20位艺术家和20位非专家观看一系列的绘画作品。
Exclude : hotel expense , personal expense , gratuities to guides and drivers .
不包含：酒店费用，个人消费，导游司机小费。
Cuba has already begun dismantling its system of state gratuities and subsidised goods and services , including help with energy bills , the meals at work and the world 's longest-standing food ration .
