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I am typing a document in both Chinese and Hebrew. When I use the following codes for Chinese, everything works fine:

documentclass[UTF8]{ctexart}



begin{document}



    tableofcontents



    begin{abstract}

        这是简介及摘要。

    end{abstract}



    section{ 前言 }



    section{关于数学部分}

    数学、中英文皆可以混排。You can intersperse math, Chinese and English (Latin script) without adding extra environments.



    這是繁體中文。



end{document}

But when I tried to add Hebrew by adding

usepackage[utf8x]{inputenc}
usepackage[hebrew,english]{babel}

It does not compile properly. The error message was

Font LHE/cmr/m/n/10=jerus10 at 10.0pt not loadable: Metric (TFM) file not found. select@language{hebrew}

Anyone knows how to fix the problem?

The [hebrew] package option of babel does not really work any more. It tries to load a set of legacy fonts in the 8-bit LHE encoding. (In this case, it is not even looking for a Type 1 font, but the Metafont source for a bitmap font.) In theory, there’s a package called ivritex floating out there that’s supposed to provide backwards compatibility for this; in practice, the maintainer says that it’s a lot simpler to switch to Unicode. Using the new toolchain also obviates all the hacks needed to make UTF-8 and Unicode fonts mostly work with an inherently 8-bit TeX engine.

The workaround is to load Hebrew with babelprovide[import=he]{hebrew} instead. You must then pass the [bidi=default] package option to babel for bidirectional text to work. To change the output encoding to Unicode, you need to define a set of fonts with babelfont.

Here’s an example. I changed the ctexart document class to article with babel, and set all the fonts with babelfont, mainly because ctex has no English documentation. I couldn’t tell you how compatible it is with either babel or polyglossia. If it’s important to write in multiple languages without special markup, you could try ucharclasses, but you might run into problems with right-to-left languages such as Hebrew or Arabic.

documentclass{article}

usepackage[paperwidth=10cm]{geometry}

usepackage[bidi=default]{babel}

usepackage{fontspec}



babelprovide[main, import=en, language=Default]{english}

babelprovide[import=he]{hebrew}

babelprovide[import]{chinese-simplified}

babelprovide[import]{chinese-traditional}



babelfont{rm}

          [Scale=1.0, Ligatures={Common, TeX}]{Latin Modern Roman}

babelfont{sf}

          [Scale=MatchLowercase, Ligatures={Common, TeX}]{Latin Modern Sans}

babelfont[hebrew]{rm}

          [Scale=MatchLowercase, Language=Default]{David CLM}

babelfont[hebrew]{sf}

          [Scale=MatchLowercase, Language=Default]{Miriam CLM}

babelfont[chinese-simplified]{rm}

          [Scale=MatchLowercase]{Noto Serif CJK SC}

babelfont[chinese-simplified]{sf}

          [Scale=MatchLowercase]{Noto Sans CJK SC}

babelfont[chinese-traditional]{rm}

          [Scale=MatchLowercase]{Noto Serif CJK TC}

babelfont[chinese-traditional]{sf}

          [Scale=MatchLowercase]{Noto Sans CJK TC}



begin{document}



    tableofcontents



    begin{abstract}

      begin{otherlanguage}{chinese-simplified}

        这是简介及摘要。

      end{otherlanguage}

    end{abstract}



    section{foreignlanguage{chinese-simplified}{前言}}



    section{foreignlanguage{chinese-simplified}{关于数学部分}}

    foreignlanguage{chinese-simplified}{数学、中英文皆可以混排。} You can intersperse

    math, Chinese and English (Latin script) foreignlanguage{hebrew}{או עברית}

    without adding extra environments.



    foreignlanguage{chinese-traditional}{這是繁體中文。}



end{document}

“Without adding extra environments” is now a blatant lie. You can make Chinese the main language instead of English, but then you will have to localize certain strings such as the Table of Contents. The call to geometry is solely to make the output fit within the allowed image size here.

If you’re writing documents in Chinese and Hebrew, you presumably have fonts for these languages installed on your system already, and can replace the ones I picked with them. You do not need any special TeX fonts with fontspec; any modern system font will work. If you want to install the fonts I used in this example, you should do so from one of the following sources, in order. A: an operating-system package, such as fonts-noto-cjk and culmus on Ubuntu; B: a CTAN package, such as notoCJKsc; C: from the Culmus project and the Noto CJK homepage.

This compiles with XeLaTeX, requires Babel 3.27 or later, and is written to work around the bug that babelfont in 3.27 ignores default font features. There’s already a patch to fix this.