社会系统是个人之间以及群体之间关系的系统。

The concept of computational efficiency is central to the design of learning algorithms.

语出汉·桓宽《盐铁论·毁学》。坏话不说，坏事不干，可谓洁身自好。

儿童是通过努力从事活动，从而使个人得到发展的。

I've always believed that if you put in the work, the results will come.