n.平均数;平均水平adj.平均的;一般的;通常的
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The grammatical words which play so large a part in Englishgrammer are for the most part sharply and obviously differentfrom the lexical words. A rough and ready difference which mayseem the most obvious is that grammatical words have “less meaning”, 1.__________
but in fact some grammarians have called them “empty”words2.__________