“With no ink,the Cangshan Mountains paint a picture of timeless grandeur;with no strings,the Erhai Lake plucks a melody of incredible harmony.”This elegant couplet deftly evokes the romantic beauty of the Cangshan Mountains and Erhai Lake.However,there was a time when this beauty was unable to shine through because of the stain of water pollution.In January 2015,President Xi Jinping visited Gusheng Village in Dali to learn about conservation efforts on Erhai Lake.He instructed that“Erhai Lake must be protected,”and after posing for a photo with local officials,he said。