This unprecedented ability to measure time precisely found its most authoritarian expression in the factory clock, which became a [______] weapon of the Industrial Revolution.
동의어 · main, principal, chief파생어 · primarily(주로)
★ 주제문 — S3·S4·S5·S6·S7이(가) 이 문장을 떠받칩니다 — S1을(를) 맥락(으)로 뒷받침