英语句子中逗号的作用

Question

Current laws targeting marijuana users place undue burdens on law enforcement resources, punish ill Americans whose doctors have prescribed the substance and unfairly affect African-Americans, said Frank, flanked by legislators and representatives from advocacy groups.

这句话中resources, punish 之间的逗号起什么作用.

Answer 1

逗号当然是表示句子的分层了。在这句话中一共有三个并列的谓语，分别是：place,punish,affect. 通常英语中当并列超过两个时，都会用这样的结构。如： A, B and C. 也就是说只有最后两个才会用and，前面的都是用逗号的。不知道这样说你明白了没有。

Answer 2

句意停顿和关系承接