Synonyms for «mechanics behind something»

Synonyms for individual words can be found below.

If it's your first time buying a baby bassinet, you'll have to understand the underlying mechanics behind it. (newmommysplace.com)
Though they are undoubtedly complex, the basic mechanics behind them are quite simple. (bestliferates.org)
I should state first off that I'm not much of a car guy when it comes to the actual mechanics behind them. (mechanics.stackexchange.com)
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