儿童掌握数字词汇的概念需要付出很大的努力。
It takes great efforts for children to grasp the concept of number words.
孩子们被灌输数字词汇之前，只能大概辨别3以上的数目。
Prior to being spoon-fed number words, children can only approximately discriminate quantities beyond three.
一些孩子在期间只会从父母那里听到4个数字词。
Some kids heard as few as four number words from their parents during a session.
一些孩子在期间只会从父母那里听到4个数字词。
Some kids heard as few as four number words from their parents during a session.
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