In the late 1700s and the earlier 1800s, the development ofthe piano coincided withthegrowthof the middle class in Western Europe.
在18世纪晚期和19世纪早期,钢琴的发展恰好与西欧中产阶级的壮大是同步的。
2
It was only withthegrowthof paediatrics and psychology in the twentieth century that studies could be carried out on a more objective, if still not always very scientific, basis.