Vivax often debilitates , but rarely kills .

而间日疟原虫则较为缓和，通常不会致命。

They think lasers could be used to zap the mosquitoes that carry malaria , a disease which kills more than a million people each year , most of them children , and debilitates hundreds of millions more .

他们认为可以用激光来歼灭携带疟疾病毒的蚊子，疟疾每年害死了一百多万人，绝大多数都是儿童，此外还使几亿人病弱不堪。

Recently , though , the focus has shifted towards malaria , which kills a million people a year , most of them children , and debilitates hundreds of millions more .

近来，这些焦点已经转移到疟疾上来，疟疾一年大约杀死一百万的人，其中大部分是儿童，同时还会削弱数百万人的健康。