133 Smile, Everybady! p.416

（单词翻译）

    "When you're smiling,the whole world smiles with you." These are the words taken from an old song. These
words must have given Tomoji Kondo a bright idea. He started smiling classes. Now, they're all over Japan.
People from all walks of life, aged¹ 20 to 83, attend these classes.
    As you enter the class, you must shout out, "Konbanwa!"(Good evening!) as loudly and cheerfully² as
possible. Then you're supposed to make direct³ eye contact and smile as you shake hands with your classmates.
No bowing is necessary. Laughing is not allowed, either. According⁴ to Kondo, smiling immediately makes you
fell better. Sound like a good idea? Why not give it a try?

go bananas = go nuts = go crazy
bristling = difficult
Smile is the best medicine for your health.
contagious 传染的
seasoned traveller 老道的游客
attend to your studies  注意
should        be supposed to 更委婉
give it a shot = give it a try