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释义:知足常乐的人会感到快乐,没有欲望没有追求的人会感到轻松。
I do not think anything that I have done is of any interest to the general public.
The most important political challenge of our time is to create strong, effective, and accountable states.
石油开采的创新不是可选的,而是可持续发展的必要条件。