Let me see

resort to: That millionaire now goes bankrupt, becomes a homeless wanderer and must resort to pitching tents on the street

revel in: She reveled in the sorrow of losing her parents

grasp: Many years ago I was very ingenuous, not sophisticated and could not grasp the essence of surface appearances

exceedingly: This chemical experiment demands exceedingly high temperature and high pressure

(a) handful of: I saw him sneakingly add a handful of strange powder in the dishes

unsteady: After a long time of the serious traffic accident his legs are still a bit unsteady

unequivocal: The scientists have found some unequivocal evidence to this new theory

eureka: After a long desperate time in our lab we finally had our eureka mmoment!

rare: Helium is a kind of rare gas and is often used in the industry