from these three separate lines of research, that for every dollar invested in early childhood programs, the per capita earnings of state residents go up by two dollars and 78 cents, so that's a three-to-one return.
这三个不同方向的研究结果表明 在儿童早教计划中每投入一美元 会对各州居民的人均收入 增加2美金78美分 所以这是三比一的回报率