乐观是为创造更美好未来的一种策略
"Optimism is a strategy for making a better future."
People with a sense of fulfillment think it a good world and would like to conserve it as it is, while the frustrated favor radical change.
煤炭企业的未来在于智能开采和清洁利用。
艺术的本质功能是道德性的。