注意，虚词（empty words）也可以被添加。

Note that empty words can be added.

youdao

比如说，像“the”、“that”和“of”之类的词可以作为虚词。

For instance, words like "the, " "that" and "of" can act as function words.

youdao

墨子对虚词的研究做出了一定的贡献。

Mozi has made certain contribution in studying on function word.

youdao

墨子对虚词的研究做出了一定的贡献。

Mozi has made certain contribution in studying on function word.

youdao