520
외로움도 전염된다
A newly-published study has shown that loneliness can spread from one person to another, like a disease.
519
청바지
Jeans are pants made from a kind of cloth called denim. For many people, blue jeans represent American culture.
517
암벽 등반
An estimated nine million people rock climb in the United States. Millions more take part in the activity around the world. Some do it just for personal satisfaction. Others compete. Rock climbing can be dangerous.
515
뉴욕 센트럴 파크
This outdoor area is more than three hundred and forty hectares. It was the first public park built in the United States.
513
샤워 꼭지에도 균이
We all have heard about harmful bacteria hiding in the home. Studies have discovered evidence of harmful bacteria in toilets, on surfaces where food is prepared, even on home telephones.
511
영화 대여 서비스
Netflix is the world’s largest online movie rental service. It started in nineteen ninety-eight. It now has ten million paying members in the United States.
509
디지털 교과서
Association spokesman Charles Schmidt says electronic textbooks now represent just two to three percent of sales. But he says that is expected to reach ten to fifteen percent by two thousand twelve.
507
쉰 목소리
If using your voice is difficult, then you know what dysphonia is. The more common name for this disorder is hoarseness.
505
에어 기타
Anyone can try to play the guitar. But it takes a special talent to play an invisible guitar.
503
전자책
These days, instead of turning paper pages, many readers reach for handheld devices. These electronic readers not only store books to show on a screen, they can also read them out loud.