understanding：理解，理解力；谅解 

词根词缀：under-在下 +stand站 + -ing名词词尾

• exposure
• expound
• express
• expression
• expressionism
• expressive
• expropriate
• expulsion
• expunction
• expunge
• expurgate
• exquisite
• ex-service
• extant
• extemporaneous
• extempore
• extemporize
• extend
• extensibility
• extension
• extensive
• extent
• extenuating
• exterior
• exterminate