科学的进步不是一条直线,而是一系列曲折,常常需要回溯步骤以获得更好的立足点。
The whites came to this land for a fresh start and to escape the tyranny of their masters, just as the freemen had fled theirs. But the ideals they held up for themselves, they denied others.
创新是任何希望保持领先地位的企业的命脉。