我在钢琴调律修理业中干了近20年，发现击i’“”弦机羹匙呢损坏是个很突出的问题。造成的亘接原因是羹匙上常沾附粗糙物质。羹匙呢一旦被这种粗糙物磨损后，琴键起不来，制音器不能离弦，琴就没法弹了。修理时，我将粗糙物除去，换了新羹匙呢，可是过了一二年又会有粗糙物附着，? I worked in piano tuning and repair industry for nearly 20 years and found that striking i ’ "string machine spoons is a very prominent issue. Caused by the inheritance of the spoon is often stained with rough material. Once the spoon spoon is worn by this rough, the keys can not get up, the damper can not leave, the piano can not play. When I was repairing, I removed the rough and changed the new spoon, but after a year or two there was a rough attachment.