1.the research involved more than 50000 men and women and spanned 40 years.

2.research is ever more important to help cater for an ageing population.

3. lead author dr.kim said her study looked into 33 diffrent reports on the strenght of handshake.

4. people laugh about 17 times a day.

5. there are hundreds of laughter clubs.

6. those who struggled to get up from their arm chairs were twice as likely to die earlier than those who sprang out of their chairs.

너무 많죠 ㅠㅠ 교과서외 지문 시험범위인데 해석이 너무어려워요 ㅠㅠ..도와주세요 .ㅠ..ㅠ..