数年前美国的西尼·罗热的罪魁祸首就是蚊子，世界上一半的人口面临疟疾的威胁，蚊子唾液中的病原体就是其传播渠道。
In the U.S., mosquitoes were responsible for the West Nile outbreak, and half the world's population is at risk for malaria, which is spread via pathogens in the mosquito's saliva.
他的竞选资金中大约有一半是来自200美元或其以下的捐款，这一比例与他初次竞选相较高出了许多，佩里先生和罗姆尼先生也望尘莫及。
Roughly half of Mr Obama's war-chest came from donations of $200 or less: a much higher proportion than in his previous campaign, and than Messrs Perry and Romney can boast.
应用推荐