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.
该项研究是以澳大利亚土著居民为对象，他们拥有非常有限的数字词汇。
The study looked at Australian indigenous populations, who have very restricted vocabularies for numbers.
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