Therearethousandsofcoralreefs(珊瑚礁)intheworld;Unfortunat...
问题详情：Therearethousandsofcoralreefs(珊瑚礁)intheworld;Unfortunately,however,theyarenowinseriousdanger.Morethanonethirdareinsuchbadshapethattheycoulddiewithintenyears.__36__Herearethethreemaincause...