逗号 1. 引导副词或者短语放在句首时，后面接逗号 举例：However,the public is being inundated with stories aboutcancer-causing chemicals. After 3 months,the plants grown under phosphorus-de?cient conditions were evaluated. 类似地副词：theref…
逗号
1. 引导副词或者短语放在句首时，后面接逗号
举例：However,the public is being inundated with stories aboutcancer-causing chemicals.
After 3 months,the plants grown under phosphorus-de?cient conditions were evaluated.
类似地副词：therefore, thus, However, Nevertheless等
2. 当有三个及以上并列结构时，并列连词前需要加逗号(又称为连续逗号
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