Scientists have d_____ that this disease is carried by mice.

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Scientists have d_____ that this disease is carried by mice.
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Scientists have d_____ that this disease is carried by mice.
Scientists have d_____ that this disease is carried by mice.

Scientists have d_____ that this disease is carried by mice.
discoverd
discover: [ dis'kʌvə ]
v. 发现
Examples:
1. She discovered the joy of writing.
她感到了写作的乐趣.
2. Columbus is said to have discovered America in 1492.
据说哥伦布于1492年发现了美洲.