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
为了帮助大家高效备考托福,英语作文啦(www.)托福频道为大家带来托福写作如何写出高分长句,希望对大家托福备考有所帮助。更多精彩尽请关注英语作文啦(www.)托福频道! 1.A series of mechanical improvements continuing well into the nineteenth century, including the introduction of pedals to sustain tone or to soften it,