习俗并非任何协议或契约的结果，而是长期发展过程的产物，在此过程中它们适应了社会的生活条件。

The key is to set realistic customer expectations, and then not to just meet them, but to exceed them — preferably in unexpected and helpful ways.

Sometimes the hardest battles are fought within the silence of our own hearts.

写作是一种乐观的行为。如果你觉得它不重要，你就不会费心去做。