詞匯

1.?????????????sniff?嗅

2.?????????????preliminary?初步的

3.?????????????symptom??癥狀?

4.?????????????doggedly?頑強(qiáng)的

5.?????????????determined??堅(jiān)決的

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Dogs are being used to sniffing out coronavirus

Research is being done to find out if dogs can sniff out coronavirus in airline passengers. Preliminary tests showed that dogs can be trained to detect coronavirus with almost 100% certainty even days before symptoms begin. This hasn't been proven yet, but researchers are doggedly determined.

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