英语大神们,帮我看看这句有没有语法问题.
We continued to renovate dilapidated houses in rural areas, ensured the
safety of potable water for 63.98 million additional rural residents,
delivered electricity to 600,000 people in areas that had no power
supply, and further improved rural working and living conditions.
这些并列的句子中间为什么可以只用逗号连接呢?