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使用逗号分隔枚举中的项目。

Example: Old McDonald had a pig, a dog, a cow, a horse.

“and”之前的逗号是可选的。

Example:
 Old McDonald had a pig, a dog, a cow and a horse.
 Old McDonald had a pig, a dog, a cow, and a horse.

如果两个项目是同一个unit,请不要在“and”之前使用逗号 (Ham and eggs as a dish is a unit and should not be separated by a comma.)

Example:
 Old McDonald had soup, ham and eggs and apple pie for dinner.
 Old McDonald had soup, ham and eggs, and apple pie for dinner.

如果枚举中的所有项都以and, or, nor分隔,请不要使用逗号 

Example:
 Old McDonald had a pig and a dog and a cow and a horse.
 Old McDonald had a pig or a dog or a cow or a horse.
 Old McDonald neither had a pig nor a dog nor a cow nor a horse.


生词表:
  • [´?e?f?:] 移动到这儿单词发声  ad.&conj.因此;所以   ()



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