书写时，非限定关系从句总是用逗号隔开。
In writing, non-identifying relative clauses are always separated by commas in this way.
（非限定性定语从句）上星期我碰巧在街上遇到了李立，他似乎很忙。
Last week I happened to meet Li Li in the street , who seemed to be very busy.
（非限定性定语从句）上星期我碰巧在街上遇到了李立，他似乎很忙。
Last week I happened to meet Li Li in the street , who seemed to be very busy.
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