The emerald ash borer has destoried(destroyed) trees in the middle west(Midwest) as far east in the United States as Maryland.The insects have also spread as far north as Ontario, Canada.

• 这种翠绿色的小昆虫不仅从美国中西部一直摧毁到了美国东部的马里兰，还一直北伸到加拿大安大略地区。