思索 しさく
shisaku

Noun
Suru Verb

1. speculation; thinking; meditation

Transitive
かれらはその体系 たいけい大変 たいへん思索 しさく労力 ろうりょく ついやして仕上 しあげた。
karerawa sono taikēo taihenna shisakuto rōryokuo tsuiyashite shiageta.
They worked out the system with much thought and labor.