不存在所谓的质量问题。只有问题，而这些问题的解决方案可能涉及质量考虑。

Every problem in mathematics has a solution; it's just a matter of finding the right path.

The pharmaceutical industry has a moral obligation to put patients first.

I have paved the way for you. Just walk on it.

The uniformity of the hybrids in the first generation, the dissimilarity in the second, are facts which cannot escape the attention of an accurate observer.

概率既由我们观察的性质决定，也由我们的理性观念决定。