It is simple pleasures, such as a walk on a sunny day, which have a cumulative effect on our mood.一些简单的娱乐，譬如在一个阳光明媚的日子散步，就能使我们的心情更愉快。The team is currently carrying out research into the cumulative effect on the body of repeated doses of the medicine.这个小组目前正在研究该药物反复服用对身体的长期影响。