Old paint on canvas, as it ages, sometimes becomes transparent. When that happens it is possible, in some pictures, to see the original lines: a tree will show through a woman's dress, a child makes way for a dog, a large boat is no longer on an open sea. That is called pentimento because the painter 'repented,' changed his mind. Perhaps it would be as well to say that the old conception, replaced by a later choice, is a way of seeing and then seeing again.
成功的最好方法是坚持不懈。
——《建国方略·孙文学说》（1917—1919年）
High-quality development in the coal industry must prioritize safety first.
The beauty of mathematics only shows itself to more patient followers.