自守形式的研究是数学对称性之美的反映。
能源行业正处于关键时刻,我们必须拥抱创新,以满足世界日益增长的能源需求,同时应对环境挑战。
The facility which this revenue gives for borrowing money is what has enabled the greater part of Europe to accumulate a capital of such a magnitude.