Just speculating here. But it could be easier to find a closer Greek translation than a Chinese one. After all, a lot of the words we use in English have Greek or Latin roots.

So I can see how it'd be more difficult to get the author's meaning across in this case. There aren't always accurate translations of a concept, which convey all the meaning correctly. And at least with German or other languages, it's not unheard of to actually use the word in the original language and give it a definition, rather than translate it. Which seems harder to do with Chinese than with Greek/German/Latin.

-- EDIT: Fix some typos