用法:
1 fruit of the oak-tree, with a cup-like base 橡子, 栎实（栎树的果实）. =>illus at App 1 见附录1之插图, page i.

用法:
2 (idm 习语) big, etc oaks from little acorns grow => oak.

• expand
• expansion
• expect
• expectation
• expense
• experience
• experiment
• expert
• explain
• explode
• exploit
• explore
• explosion
• explosive
• export
• expose
• exposure
• express
• exression
• extend
• extension
• extensive
• extent
• exterior
• external