The campaign to eliminate river blindness began as the most vertical programme imaginable: helicopters dropping insecticides out of the sky.

  • 根除河盲症运动开始时是可以想象的最纵向的规划:直升飞机从空中投撒杀虫剂。

  • 互联网摘选 2025-01-20 11:56:48

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