subexpression [sʌbɪksp'reʃn]

例句:

• A boolean expression also determines which subexpression is evaluated in the conditional?
  一个boolean表达式也定义了其子表达是在条件?
  
• You can also refer to a subexpression from within a replacement string.
  还可以从替换字符串中引用子表达式.
  
• You can refer to a subexpression from within a regular expression.
  可以从正则表达式中引用子表达式.