Some people are extraordinarily good at knowing the limits of their knowledge because they have to be.

电影制作中最重要的是对自己诚实。

Education is the seed from which sustainable forestry practices grow.

解释：大部分有鳞的鱼都带有腥味，而鲈鱼却是淡味的，体现了鱼类味道的多样性。

如果没有地幔对流的概念，大陆漂移理论将只是一种猜测。