Pushed out of northern temperate zones by DDT spraying and the draining of wetlands half a century ago, malaria remains entrenched in the humid tropics of Asia.

• 虽然在半个世纪前，在北方的温带地区通过喷洒DDT和排干沼泽的办法已经消灭了疟疾，但其在亚洲潮湿的热带地区却仍根深蒂固。