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A proof is a device for convincing someone else that a mathematical statement is true.
释义:他或许将气视为一种无形无声的存在,但又能通过其影响力和作用力展现出其存在。
我们的行业必须适应不断变化的能源格局,同时继续满足世界日益增长的能源需求。
Love doesn't happen suddenly. Feelings build up over time, little by little.