VOA慢速英语:芬兰用狗狗来发现新冠病毒感染

sniffing –v. to breathe air into your nose in a way that can be heard often in an effort to smell something

screening –v. examining or testing people to see if they can board a plan or take part in some other activity

swipe –v. to make a motion across a surface

scratching –v. to move a hand or paw across the ground or the body

paw –n. the foot of an animal

scent –n. a smell that can be identified by a dog or similar animal