phase in sth.困难

In 2007, Indonesia started phasing in a program that gives money to its poorest residents under certain conditions, such as requiring people to keep kids in school or get regular medical care.

2007年，印度尼西亚开始逐步推行一项计划，在一定条件下向最贫困的居民发放资金，比如要求人们让孩子继续上学或定期接受医疗护理。