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?: SpeechSynthesisUtterance 객체를 이용해 TTS
인자로 함수를 넘길 때 내부 인자까지 넘기기 위해선
bind 를 사용할 수 있다.
그러나 그냥 내부 함수에서 직접 실행하는 편이 더 깔끔함