Promising Mosquito Repellent Announced美科学家研发新一代驱蚊剂 In many regions of the world, mosquitoes are a seasonal pest. In other regions, they carry serious diseases like malaria. The World Health Organization estimates that almost 6

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美国自由邦波多黎各现首例寨卡病毒死亡病例 The death of an elderly man in Puerto Rico marked an ominous milestone for the Zika virus in the United States. 美国自由邦波多黎各一名老人因感染寨卡病毒死亡对这个国家

发表于:2019-01-14 / 阅读(73) / 评论(0) 分类 VOA标准英语2016年(五月)