A traditional deterrent has been a series of high pitched squeals emitted from loudspeakers.
A traditional deterrent has been a series of high pitched squeals emitted from loudspeakers.
传统威吓方法是由扩音器内发出一连串的高分贝尖锐声音。
A traditional deterrent has been a series of high pitched squeals emitted from loudspeakers.
传统威吓方法是由扩音器内发出一连串的高分贝尖锐声音。