它们在出生三天之内就具有了能够发出声音的身体结构。
小海豚刚刚出生三天。早晨，阳光明媚。小企鹅来到了他家。
Little dolphin was born three days ago. One morning the sun was shining. Little penguin came to his home.
威尔·姆克的研究小组录制了60个健康新生儿在出生三天至五天时的哭声。其中30个宝宝出生于说法语的家庭，另外30个出生于说德语的家庭。
Wermke's team recorded the cries of 60 healthy newborns, 30 born into French-speaking families and 30 born into German-speaking families, when they were three to five days old.
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