a teacher is like spring，who nurtures new green sprouts，encourages and leads them，whenever they have doubts.a teacher is like summer，whose sunny temperamentmakes studying a pleasure，preventing discontent.a teacher is like fall，with methods crisp and clear，lessons of bright colors and a happy atmosphere.a teacher is like winter，while it's snowing hard outside，keeping students comfortable，as a warm and helpful guide.
teacher， you do all these things，with a pleasant attitude;you’re a teacher for all seasons，and you have my gratitude!
all living cell send out tiny pulses of electricity. as the heart beats, it sends out pulses of record; they form an electrocardiogram, which a doctor can study to determine how well the heart is working. the brain, too, sends out brain waves of electricity, which can be recorded in an electroencephalogram. the electric currents generated by most living cells are extremely small - often so small that sensitive instruments are needed to record them. but in some animals, certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all. when large numbers of these cell are linked together, the effects can be astonishing.
the electric eel is an amazing storage battery. it can seed a jolt of as much as eight hundred volts of electricity through the water in which it live. ( an electric house current is only one hundred twenty volts.) as many as four-fifths of all the cells in the electric eel’s body are specialized for generating electricity, and the strength of the shock it can deliver corresponds roughly to length of its body.
when i learned english, i felt so hard, because no matter hard i tried, i just could not understand the grammar. one day, my sister asked me why was i so confused with english, i told her i did not know, i was so afraid of it. then she asked me to watch english movie and listened to the english songs. at first, i fell in love with these songs, i learned to sing them, i found i could remember more and more words. i also felt very interested in the movie, i could learn the local words. with interest, i make great progress, i am not afraid of english any more. interest is the best teacher.