The monkeys had been immunized with a vaccine made from infected cells.这些猴子已经注射了由受感染的细胞培养而成的疫苗。Monkeys were screeching in the trees.猴子在树上吱吱地叫着。Circus monkeys are trained to be very docile and obedient.马戏团的猴子训练得服服贴贴的....
The container is invisible until you shine an ultraviolet light on it.那个柜子只有用紫外线照射才可以看见。It's called ultraviolet rays.它被叫做紫外线.The ozone layer surrounding the earth protects our skin from being hurt by the ultraviolet...