体型大的生物由于行动慢, 不可能猎取到动物性食物.With very large organisms that are now relatively sluggish, animal food cannot be caught.素食者不吃任何动物性食物,易患维生素B12缺乏症.Vegans consume no animal products and are susceptible to vitamin B 12 deficiency....
There is a shortage of carrots. So everybody starts growing carrots. Next season, surprise, surprise, there is a glut of carrots.胡萝卜紧缺，于是大家都去种胡萝卜。等到来年这个时候，可想而知，胡萝卜就会过剩。The glut of coffee led to a sharp drop in prices.咖啡供...