36. Malaria has long troubled the populations of South America, Africa, and Asia, where mosquito bites infect up to 500 million people a year with this serious and sometimes fatal parasitic blood disease.
疟疾长期以来一直困扰南美，非洲和亚洲的居民，在这些地区，每年有多达500 万人由于被蚊子叮咬而染上了这种由寄生虫引起的严重有时甚至是致命的血液疾病。
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拆句
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难词分析
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难句解析
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Malaria has long troubled
the populations of South
America, Africa, and Asia ,
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Malaria n. 疟疾；tlouhle v.麻烦，困扰；population n. 人口
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主句，主谓宾结构
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where mosquito bites infect
up to 500 million people
a year with this serious
and sometimes fatal
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