探究たんきゅう
tankyū

Noun
Suru Verb

1. research; investigation; enquiry; inquiry; study

Transitive
人間にんげん真理しんり探究たんきゅうたいして不朽ふきゅう貢献こうけんをした書物しょもつ、我々われわれ偉大いだい書物しょもつぶのである。
ningenno shinrino tankyūni taishite fukyūno kōken'o shita shomotsuo warewarewa idaina shomotsuto yobu nodearu.
Those books which have made a lasting contribution to man's quest for truth, we call great books.