Anti-malarial vaccines are now under-going trials.

抗疟疾的疫苗正在试验阶段。

柯林斯例句

But Kelly says the parasite gains the upper hand when anti - malarial drugs are taken sporadically.

但是凯莉说,如果 抗 疟疾药物不是按时服用,疟原虫就会产生抗药性.

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