Tā / zhì / xué / shí / fēn / yán / jǐn / fán / yù / zhòng / dà / wèn / tí / zǒng / yào / jí / shēn / yán / jǐ / hòu / cái / xià / jié / lùn

他治学十分严谨，凡遇重大问题，总要极深研几后才下结论。

He is rigorous in his research and always investigates major issues thoroughly before reaching a conclusion.