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本期内容：
The World Health Organisation warned that Zika, a mosquito-borne virus linked to brain deformation in human fetuses, is likely to spread to every country in the Americas except Canada and Chile. Brazil has reported 3,893 cases of microcephaly—an abnormally small head—in infants since October, up from fewer than 200 a year previously. Zika is the suspected cause.
词义解析:
Zika: 寨卡病毒
Mosquito：蚊子
Virus：病毒
Deformation：畸形
Fetus：胎儿
Microcephaly：头小畸形
