1·Direct comparison with exercise is difficult, but Berk estimates the physiological benefits were equivalent to those of a moderate 20-minute workout.
将它直接与锻炼相比较是困难的，但是伯克估计生理益处是等效的适度的20分钟的锻炼。
2·Finally, my best friend, Lance, said, "Berk, why didn't you answer us?"
最后，我最好的朋友兰斯问我：“伯克，你怎么不回答我们？”
3·In the mid-1990s, Dr Berk found that laughter increases the number of natural killer cells in cancer patients. Natural killer cells are the body's way of fighting tumours.
早在上世纪九十年代，伯克博士就发现笑会增加癌症病人天然杀伤细胞(也叫抗癌细胞)的数目，天然杀伤细胞是身体对抗肿瘤的办法。
4·This could be very important exercise, Berk avers , for elderly and sick people who can't get out and run two miles.
这可能是非常重要的运动，伯克断言，老人和生病的人谁都不能出门和运行两英里。
5·Berk says readers are impatient and will no longer wait months to learn what celebrities are wearing.
伯克说，读者已没有耐心了，再也不会为了获悉名人的衣着资讯而等上数月。