1.A series of mechanical improvements continuing well into the nineteenth century, including the introduction of pedals to sustain tone or to soften it, the perfection of a metal frame, and steel wire of the finest quality, finally produc
為了幫助大家高效備考托福,英語作文啦(www.)托福頻道為大家?guī)硗懈懽魅绾螌懗龈叻珠L句,希望對大家托福備考有所幫助。更多精彩盡請關注英語作文啦(www.)托福頻道! 1.A series of mechanical improvements continuing well into the nineteenth century, including the introduction of pedals to sustain tone or to soften it,