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.

在科学中，就像在生活中一样，重要的事情很少是简单或显而易见的。

To rapidly reveal the true character of a person you just met， move them onto an abysmally slow internet connection. Observe.

食品生产的未来在于平衡效率和环境管理。