1、Use two commas, not one, to set off a nonrestrictive clause in the middle of a sentence.
同樣的，前者由非限制性定語從句構成。 但在科技文中，你需要將其轉換成名詞結構。

2、These nonrestrictive units had concrete floors on an interior steel frame.
這些非抗震單元在內(nèi)部為鋼構架上是水泥地板。

3、Nonrestrictive phrase and clause are set off by commas.
非限制性短語或從句前后用逗號分隔。

4、When a nonrestrictive clause appears in the middle of a sentence, place commas around it.
當非限制性成分在句子中間出現(xiàn)時，應當在它前面和后面加逗號。

nonrestrictive翻譯