If you've ever been to a rock gig, you'll probably recognise this screeching noise.

如果你曾去过摇滚乐的演唱会，你可能知道这种尖锐的杂音，这就是反馈的杂音。

youdao

If you've ever been to a rock gig, you'll probably recognise this screeching noise.

如果你曾去过摇滚乐的演唱会，你可能知道这种尖锐的杂音，这就是反馈的杂音。

youdao