在两个主要子句之间使用逗号,这两个子句用and或者or分隔。
example: we ran out of fuel, and the nearest petrol station was 5 miles away.
使用逗号分隔序列中句子的各个部分。
example: she ran down the stairs, opened the door, saw her boyfriend(,) and gave him a kiss.
如果句子的这些部分被and或or分隔,请不要使用逗号。
example: she ran down the stairs and opened the door and saw her boyfriend and gave him a kiss.
注意:如果两个主要子句没有用and或or分隔,请不要使用逗号,而是使用分号。