Watt says as climates warm, unwelcome disease vectors will thrive like the Asian tiger mosquito.

瓦特说，随着气候变暖，讨人厌的疾病媒介将像亚洲虎蚊一样茁壮成长。

People don't know they're sick and then they become disease vectors, spreading it everywhere they go.

人们不知道自己生病了， 然后就成了疾病的传播媒介，到处传播。