View to the mechanics inside a older grand piano, hammer from below and damping from above on the strings of the acoustic musical instrument, selected focus, narrow depth of field .查看一架老式大钢琴的内部结构,锤子从下面敲击,阻尼器从上面敲击声学乐器的弦,选择焦点,狭窄的景深相似图片收藏下载小样