Kids don't develop this deeply rooted behavior until around age four, the study found.

他们发现，孩子们在4岁以前，并没有这种根深蒂固的行为。

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Kids don't develop this deeply rooted behavior until around age four, the study found.

他们发现，孩子们在4岁以前，并没有这种根深蒂固的行为。

youdao