UN agencies such as the World Food Programme (WFP), UN Women and the United Nations Children’s Fund (UNICEF) can all exert their respective roles to help Africa break the transport bottlenecks, ensure last mile delivery of supplies, medicines and vaccines so that vulnerable groups and people in impoverished and far-flung areas can receive timely and effective medical treatment.
ensure 和 help 并列。在新闻英语中，经常省略连词 and ，用逗号代替。给人以意犹未尽的感觉。也就是说，加了 and 后，联合国有关部门的工作范围就这样么大，没有 and 使人觉得“意犹未尽”，还有很多工作没有列举完。
