For bitcoin core, in class CAccountingEntry, what's the meaning of some variables?

For bitcoin core, in class CAccountingEntry, what's the meaning of some variables?

When I read the bitcoin core source code, I don't understand the meaning and how to use those variables:

int64_t nTime;
std::string strOtherAccount;
mapValue_t mapValue;
uint64_t nEntryNo;
std::vector _ssExtra; (private one) Could anyone help me out? Thanks

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