两者基本上是一样的用法,都用在诸多列举项目之后,加不加逗号与前面的选项分开都可以.但都不能用在句首.
比如:
This area has a high incidence of crime,disease,unemployment,etc.(etc加逗号)
This area has a high incidence of crime,disease,unemployment etc.(etc不加逗号)
“这个地区的犯罪率、发病率、失业率等很高.”
用and so on 来表达:
This area has a high incidence of crime,disease,unemployment,and so on.(and so on加逗号)
This area has a high incidence of crime,disease,unemployment and so on.(and so on不加逗号)
不一定放在完整一句的句尾,但是至少是分句的句尾.
比如:If one talks about food,clothes,drink and so on,he may be more concentrated on daily life.
这不算整个句子的句尾,但在第一个分句子中是句尾.
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