Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein
between her peck at the the hidden color
「"peck at"」—— 听母语者在 YouTube 视频里怎么说
在 4 个 YouTube 视频的字幕中找到了 6 条「"peck at"」的用法。点击任意结果即可听到母语者的真实发音——完全免费，无需注册。
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the crow continues to like just peck at its at its back.
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TheSorryGirls
I'm going to peck at this grass with my free range abilities.
Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein
harder still by introducing a delay between her peck at the the hidden color
Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein
between her peck at the the hidden color and the availability of the color keys
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And it flies up while the crow continues to like just peck at its at its back.