The tree that can ""flute"", leafless tree throughout the year, glittering tree, tree that can produce ""rice"",""bread"",""milk"" and oil,and the highest tree ...... This book introduces some extracurricular knowledge about plants. Accumulation of extracurricular knowledge is like the root that is constantly absorbing nutrients underground. When you have acquired enough extra-curricular knowledge,you will become strong enough to withstand wind and rain,capable enough to give a satisfactory answer to teachers questions, confident enough to pour out words in front of your classmates,and qualified enough to serve as an ""advisor"" for your family and friends.You will also have enough knowledge to say something in network communication ......