在观察性研究中，我们常常不得不依赖于无法直接检验的假设。

保护海洋生态，就是保护渔业的未来。

"I don't think of myself as a female filmmaker. I think of myself as a filmmaker."

Life is a canvas, paint it with your colors.

在没有航海图的海域上航行是需要勇气的。

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.