✔ 最佳答案
non-defining是指形容一個清釋的人或物時要加上'' , ''在你形容的東西後面!
example : Joey Yung , who is the singer in hong kong , sing very well .
但如果你要形容的東西是不清釋既人或物時,就不需加上'' , ''
example : That girl who is wearing blue clothes , is very pretty.
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