He proposed that the earliest examples of this are an infant's attempts to control physical objects, such as toys or his or her own limbs.
他提出，最早的例子是婴儿试图控制实物，如玩具或他或她自己的四肢。
He proposed that the earliest examples of this are an infant's attempts to control physical objects, such as toys or his or her own limbs.
他提出，最早的例子是婴儿试图控制实物，如玩具或他或她自己的四肢。
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