yōgu kyōka
1. tool subject
Noun
1. tool subject
1. textbook; coursebook
1. subject; curriculum
1. tool; implement
1. blackmail; extortion
1. strengthening; intensifying
2. reinforcement
1. Probably a textbook.; It's likely a textbook.
1. Probably a textbook.; It must be a textbook.
1. Textbook.; It is a textbook.
1. It is not a textbook.