进入春天,花开树绿,北京却迎来了“不速之客”——沙尘暴。据媒体披露,随风而来的沙尘却是发源于曾有“草原绿洲”之称的内蒙古额济纳旗。历史上,祁连山脉的冰雪融化后,经甘肃境内的黑河,源源不断地流到额济纳河及其末端的居延海。河水甘霖般滋润着这片绿洲,林木茂盛、水草丰美 Into the spring, blossom trees, Beijing has ushered in the “uninvited guest” - sandstorms. According to media reports, dust from the wind but originated in Ejin Banner, once named “Prairie Oasis.” Historically, after the ice and snow melted in the Qilian Mountains, the Heihe River in Gansu continued to flow to the Ejin River and the Juyan Sea at the end. River water moist with this oasis, lush forests, lush plants