正文

A Dog's Sniffer Could Be Your Best Friend in Disaster

2015-09-13来源:VOA

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Words in This Story

sniffer -- n. slang for 'nose'

hone -- v. sharpen, refine or perfect

certified -- v. officially recognize

terrain -- n. a stretch of land, specially with ups and downs

ultimate -- adj. final or best

impassable -- adj. impossible to travel over