Decreases in malaria deaths have been observed in all WHO regions, with the largest proportional decreases noted in the European region, followed by the region of the Americas.
世卫组织各区域的疟疾死亡人数均已降低，其中降幅最大的是欧洲区域，其次是美洲区域。
2
The special feature of variable rate reaching law is that it is directly proportional to the norm of state vector and can result in a sector-shaped switching region.