It is the sound of hunger, guttural and primal and expressed in its rawest form. And more often than not we hear it from none other than Apple, and right in the middle of a recording session. "I'm on a diet," she announces apologetically after the aftershocks subside. "You look fine," we reply. And she smiles and we continue.Occasionally, Echo force feeds her chicken to make it go away. This lesson covers everything up to the force-feeding stage. If you have to do that in mandarin, you're on your own.