1. They are often used with similar meaning, Bspeakbbeing more formal. 
   这两个词的意思相近，只是。
2. the philosophical theory that formal (logical or mathematical) statements have no meaning but that its symbols (regarded as physical entities) exhibit a form that has useful applications. 
   哲学理论认为形式（逻辑或数学）陈述没有意义，陈述的符号表现形式有实用性。
3. formal and informal group 
   正式群体与非正式群体
4. A formal reprimand; a formal document. 
   正式谴责；正式文件
5. a lavish formal dance. 
   一场非常丰富的正式舞会。

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