func·tion word
noun/ˈfʌŋkʃn wɜːd/
/ˈfʌŋkʃn wɜːrd/
(also functor)
(grammar)- a word that is important to the grammar of a sentence rather than its meaning, for example ‘do’ in ‘we do not live here’
功能词，虚词（如 we do not live here 中的 do 一词）