The progress of science is not a straight line, but a series of zigzags, often retracing steps to gain a better foothold.
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。
发出履行性陈述并不是在做陈述，因此履行性陈述的发言既不真实也不虚假。
I'm a human being and I fall in love and sometimes I don't have control of every situation.
最好的文学挑战我们以不同的方式看待世界。
The quality of an organization's culture determines the quality of its products and services.
在每一本书中，都有作者灵魂的一部分。