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1. Oxford Dictionary

   placeholder

   • IPA[ˈpleɪsˌhəʊldə]

   英式

   • n.
     a significant zero in the decimal representation of a number.；a symbol or piece of text used in a mathematical expression or in an instruction in a computer program to denote a missing quantity or operator.

   • noun: placeholder, plural noun: placeholders

2. • 釋義

   n.

   名詞

   • 1. a significant zero in the decimal representation of a number.
   • ▪ a symbol or piece of text used in a mathematical expression or in an instruction in a computer program to denote a missing quantity or operator.
   • 2. an element of a sentence that is required by syntactic constraints but carries little or no semantic information, for example the word it as a subject in it is a pity that she left, where the true subject is that she left.
3. • 更多解釋

   placeholder

   • IPA[ˈplāsˌ(h)ōldər]

   美式

   • n.
     a significant zero in the decimal representation of a number.

   Oxford American Dictionary