I don't see anything wrong in this sentences . So according to me it is ok and meaningful .
2014年8月1日
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"During the party, the topic of our conversation somehow turned to our supervisor's girlfriend."
You could also say, "During the party, we somehow started talking about our supervisor's girlfriend."
2014年8月1日
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No. Any of these will do:
During the party, the topic of our conversation somehow, WAS about our supervisor's girlfriend.
During the party, the topic of our conversation WAS, SOMEHOW, about our supervisor's girlfriend.