心悸是什么意思

When the birds' tweet joins the sound of camara shutters in a “symphony”, when the airport runway joins the subway tracks in a “polyphony”, and when the cheers and Olympic ideals are heard in multiple languages, “sound” has become yet another window that offers a glimpse into Beijing, a center for international exchanges. Where in Beijing can one hear the sound of the world? Let’s hear the voice of Beijing from high above.