to sum－>to summarize/in conclusion
explain－>interpret/illustrate change－>alter chance－>alternative custom－>convention/tradition think－>contemplate/muse/meditate/retrospect arouse－>ignite/stimulate/spur/motivate limit－>stress/hinder/hamper key－>crucial/vital/consequential old－>ancient emphasis－>accentuate devote to－>dedicate to character－>trait/individuality/idiosyncrasy/personality expect－>anticipate join－>participate delegate－>representative bias－>prejudice/discriminate/tendency thrive－>palmy/flourishing/prosperity clash－>conflict/collision/rencounter