When a nonrestrictive clause a ears in the middle of a sentence, place commas around it.
When a nonrestrictive clause a ears in the middle of a sentence, place commas around it.
当非限制性成分在句子中间出现时，应当在它前面和后面加逗号。
When a nonrestrictive clause a ears in the middle of a sentence, place commas around it.
当非限制性成分在句子中间出现时，应当在它前面和后面加逗号。