<正>圣拉斐尔瀑布周围植被茂盛、蝴蝶环绕,是厄瓜多尔最迷人的景观之一。作为厄瓜多尔最高的瀑布,每年吸引数万游客。但在今年早些时候,这座瀑布突然消失了。Early in February, the nearly-500-foot-high San Rafael Waterfall in Ecuador—the largest in the South American nation—appears to have disappeared. But why?