当座椅是安全时给用户一些反馈以让其知道(一个正常的咔嚓声或啪嗒声就可以做到了)。
Give the user some feedback to let them know when the seat is properly secured (a healthy click or snapping sound should do it).
但是，目前市面上的自动声反馈抑制产品，大多是国外品牌，价格不菲。
However, most of automatic feedback suppressors in domestic market are imported from oversea and expensive.
扩声系统中普遍存在由声反馈导致的啸叫问题。
The acoustic feedback even howling is a well-known problem in sound reinforcement system.
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