修改了一下，可以用在 ox-hugo 中了。
(defadvice org-hugo-paragraph (before org-hugo-paragraph-advice
(paragraph contents info) activate)
"Join consecutive Chinese lines into a single long line without
unwanted space when exporting org-mode to hugo markdown."
(let* ((origin-contents (ad-get-arg 1))
(fix-regexp "[[:multibyte:]]")
(fixed-contents
(replace-regexp-in-string
(concat
"\\(" fix-regexp "\\) *\n *\\(" fix-regexp "\\)") "\\1\\2" origin-contents)))
(ad-set-arg 1 fixed-contents)))