单词 | bird pecks |
释义 | bird pecks Typical operanda for pigeons and other birds are response keys with a switch that closes if the bird pecks at the key with sufficient force. Retrieved from Wikipedia CC BY-SA 3.0 For each grain the bird pecks, the observer writes down the letter which that grain represents. Retrieved from Wikipedia CC BY-SA 3.0 The bird pecks through the cactus skin, then excavates downward to hollow out a space for its nest. Retrieved from Wikipedia CC BY-SA 3.0 |
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