Alexander Hjertström thought his breathing problems were behind him. But when he embarked upon a study trip to India, an old foe came spluttering back to life.
원문출처 : http://www.cnn.com/2016/12/21/world/mask-air-pollution-airinium/index.html
원문출처 : http://www.cnn.com/2016/12/21/world/mask-air-pollution-airinium/index.html