“Extending” in Japanese
Short answer
Extending in Japanese is “増補” (zouho). Full meaning: extending (e.g. a book), augmenting, enlarging, supplementing.
Other ways to say “Extending” in Japanese
恢弘
kaikou propagation, spreading out, extending
展開
tenkai development, evolution, progression, unfolding, (plot) twist; expansion, spreading out, extending, deployment, building up; expansion (of an algebraic expression)
てん開
tenkai development, evolution, progression, unfolding, (plot) twist; expansion, spreading out, extending, deployment, building up; expansion (of an algebraic expression)
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