电脑的重要性(The Importance of Electricity)

　　when you go to work in the morning and find that traffic lights dont work, the traffic jam will certainly happen. a patient needs to be operated on at once.

　　what will happen if the operation cannot be made because of the electricity. without electricity, we can neither watch tv, listen to the tape, nor chat on line. electricity is closely related to our daily life.

　　how terrible it would be if there were no electricity