expressions:
It is called a clavichord这被称为古钢琴
a friend of my father's我父亲的朋友
words：
musical，adj，音乐的
instrument，n，乐器
clavichord，古钢琴
recently，最近
damage，伤害
shock，震惊
made in表示产地
made of 表示某种材料
made from 表示多种材料
made by 表示制造人
That's where we keep it.
we mustn't touch it.
a friend of my father's is mending the clavichord.