Maybe the ideographic space U+3000 works.

在 2023年2月21日週二 03:42，Sylvain Hubert via ntg-context <ntg-context@ntg.nl> 寫道：

> Dear list,
>
> Does anyone know how to insert a horizontal space in a CJK document with
> \setscript[hanzi]?
>
> \setscript[hanzi]
> \definefontfamily[mainface][rm][notoserifcjkhk][]
> \setupbodyfont[mainface]
> \starttext
> 口口\hspace[big]口口   % with \setscript[hanzi], the \hspace is ignored
>
> \dorecurse{100}{口}  % without \setscript[hanzi], the line is not properly
> wrapped
> \stoptext
>
> Many thanks,
> Sylvain
>
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