1.  Life is completil , we must know more knowledge, or we can't adap to the life better .

2.  From child to adult, we study in school constantly, only know theroy knowledge from the book , that is not enough, we must combine practise in society, so that, we can learn knowledge really .

3.  Because, we only work hard in the class, but we don't know how to pratise it ; we only know the knowledge in the textbook, but we don't know the news, the latest technology of science in the world.

4.  Moreover, I will know some knowledge about agriculture.

5.  We can't only want to study quickly, forget interview all lesson.?

6.  Go over will let you know new knowledge" .

7.  You will not know other knowledge.

8.  Only when you know the old knowledge can you learn the new knowledge.

9.  People also know some knowledge of medical , so they can apply them in their everyday lifes .In a word, it is the development of science that make the trend in the chart appeared -- the life expectancy rising and the infant mortaility going down .

10.  If the condition changes, you will do nothing because you know little knowledge about other thing .