知识扩展
习语积累
习语 n. have sth at your fingertips 掌握(信息等);熟悉,精通(知识等);对…了如指掌;有…随时可供使用 to have the information, knowledge, etc. that is needed in a particular situation and be able to find it easily and use it quickly to your fingertips (BrE) 完全;十足 in every way She's a perfectionist to her fingertips. 她是个道道地地的完美主义者。