translation.en: It started in Japan. Sumitomo had developed a technology essentially to impregnate a polyethylene-based fiber with organic insecticide, so you could create a bed net, a malaria bed net, that would last five years and not need to be re-dipped.
translation.zh: 它始于日本。住友集团开发出一种可以从根本上 注入有机杀虫剂的聚乙烯纤维的技术， 因此可以由此制作出一种蚊帐， 这种防疟疾蚊帐有五年有效期而且不需要重新蘸熏（杀虫剂）。