tā de / lǐ lùn / shè jí / chāo wù lǐ / lǐng yù / hěn nán / yòng / shí yàn shì / yàn zhèng

他的理论涉及超物理领域，很难用实验室验证。

His theory touches on the realm of the metaphysical and is hard to verify in a laboratory.