Positive psychology is as concerned with strength as with weakness, as interested in building the best things in life as in repairing the worst.
积极心理学既关注弱点也关注优势，既对修复最坏的事情感兴趣，也对建立生活中最好的事情感兴趣。
The strongest ecosystems are those with diversity.
The success of any political system depends on its ability to deliver both prosperity and justice.