grammatically
  (ad.)文法上
  Gram·mat·ic·al a.
  1. Of or pertaining to grammar; of the nature of grammar; as, a grammatical rule.
  2. According to the rules of grammar; grammatically correct; as, the sentence is not grammatical; the construction is not grammatical.
  --Gram*mat*ic*al*ly, adv. -- Gram*mat*ic*al*ness, n.
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  grammatically
       adv : in a grammatical manner; "this child already speaks
             grammatically" [ant: ungrammatically]