Interaction with the multitude of microscopic organisms a baby picks up when it is born helps that system to learn friend from foe.
老师您好,请问这里的a baby应该是省略了关系副词where吧,它为何又可以省略。它并非表地点,原因,时间啥的。
picks up为及物短语动词,定语从句省略的是作宾语的关系代词,先行词为the multitude of microscopic organisms。
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