在钢琴最初出现的18世纪早期，铁被用于制造琴丝，但是这种材料的张力和强度限制了其在发高音时的能力，佐丹奴说。
During the piano's genesis in the early 1700s, iron was used to make music wire, but the material's tension and strength limited its ability to produce loud sound, Giordano said.
陈鹤琴教学法与蒙台梭利教学法是对20世纪中西幼儿教育影响深远的教育理论。
Chen Heqin teaching method and Montessori teaching method have a far-reaching impact on the Early Preschool Education theory in China and the West on the 20th century.
18世纪早期的意大利，钢琴在一位拨琴钢琴制造者手中得到完善(尽管音乐理论家们指出有更早的例子)。
The piano was perfected in the early eighteenth century by a harpsichord maker in Italy (though musicologists point out several previous instances of the instrument).
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