“Sure.” I replied, while yawning. “What is it?”
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while yawning
而打哈欠
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Sure enough, 23 chimps yawned more while watching videos of their in-group yawning than when watching videos of strange apes yawning (or familiar apes not yawning).
WSJ: Matt Ridley on Why You Just Yawned | Mind & Matter
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