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This sweater is of good quality.這件毛衣品質很好。

of+名詞＝adj，例如 I am glad I was of help to you.我很高興我對你有幫助。
                        = ...I was helpful to you.

故sth of good quality＝quality sth (quality也能當adj，指品質好的)

麥米倫字典
▪ The restaurant serves food of high quality.
  [=the food at the restaurant is very good]
▪ The dress material is of poor quality.
  [=the dress material is not good]

quality (adjective)
always used before a noun 1 : very good or excellent
▪ The restaurant offers quality service.
▪ The store sells quality furniture at reasonable prices.
▪ It can be difficult to find quality childcare.
▪ He had a quality education.

牛津字典
1 [uncountable, countable]
the standard of something when it is compared to other things like it;
how good or bad something is to be of good/poor/top quality materials of a high quality

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※ 作者: uefangsmith 時間: 2012-02-19 00:27:31