Hi, Jonathan:
Thanks for the analysis! Now I replace the trk with TRK, and xetex output is right. > > In the LuaTeX case, I don't think *any* ligatures are enabled by default, so > the language is irrelevant; notice that there's no "ff" ligature in your > output either, even though this should be expected. The input file is not right. here is the right one: luatex do not enable kerning and ligatures by default, users should specify them or just using the "default" feature. Sorry for the noise. Yue Wang
luatex.pdf
Description: Adobe PDF document
a.tex
Description: TeX document
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