虽然已有一些服务接口设计的公认方法，但是更多的时候它还是艺术而非科学。
Although there are some well established approaches to service interface design it is still more art than science.
重放位置是必须被所有目标服务器完全公认的最老的事务。
The replay position is the oldest transaction that has not been fully acknowledged by all target servers.
答：卫生人员长期短缺被公认为是影响卫生服务提供的主要障碍之一。由于卫生人员短缺，最需要的人群无法获得有效卫生服务。
A: the chronic shortage is well recognized as one of the main obstacles to delivery of effective health services to those who need them most.
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