The silence was punctuated by the distant rumble of traffic.远处传来的车辆的隆隆声不时划破寂静。

The writer could have conveyed ideas more effectively by punctuating sentences with full stops.要是用句号断句的话, 作者就能更好地表达思想了。

When you join two main clauses with a coordinating conjunction, you must also punctuate with a comma.用并列连词连接两个从句时, 也必须加逗号。