The conjunction 再说
This conjunction is used as a complement to a previous statement.
The conjunction 再说 
is used to include additional rationale or information to a statement.
再说 can be either placed at the beginning of a sentence or in between two parts of a complex sentence.
When it is placed at the beginning of a sentence:
is used to include additional rationale or information to a statement.
再说 can be either placed at the beginning of a sentence or in between two parts of a complex sentence.
When it is placed at the beginning of a sentence:Scheme
再说
sentence
Examples
再说，我们必须考虑成本
In addition, we have to take the cost into account
zài shuō, wǒmen bìxū kǎolǜ chéngběn
再说，我不太喜欢社交聚会
Besides, I’m not a big fan of social gatherings
zàishuō, wǒ bú tài xǐhuan shèjiāo jùhuì
When the conjunction is placed in the middle of a complex sentence:
Scheme
sentence 1
再说
sentence 2
Examples
我没有空，再说，我生病了
I don’t have time. Besides, I’m sick
wǒ méi yǒu kòng, zàishuō, wǒ shēngbìng le
我不太喜欢这件裙子，再说，它太贵了
I don’t really like this dress. Besides it is very expensive
wǒ bú tài xǐhuan zhè jiàn qúnzi, zàishuō, tā tài guì le