Most of the dogs will appear in airports, hospitals, disaster relief sites and other places. Sniffer dogs can have different functions in different places; sniffer dogs, for example, at airports sniff out whether passengers' luggage is subject to contraband. In hospitals, many dogs have been able to sniff out cell carcinoma in recent years, allowing humans to learn about changes in their bodies in advance. In disaster relief sites, they hear the smell of survivors, to remind disaster relief people to improve the survival rate.
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