tā / de / lǐ / lùn / yuān / xuán / nán / dǒng / chū / xué / zhě / wǎng / wǎng / wàng / ér / què / bù

他的理论渊玄难懂，初学者往往望而却步。

His theory is so profound and abstruse that beginners often shy away from it.