【正文】
ing all kinds of musical instruments in the world。 this makes physical concept to be understood deeply (3)。 with its speech output capabilities, i39。 how can i interact with a puter? there are many ways, including keyboard, mouse pointer, and touch screen。 when i press right keys, i can see and hear whatever i want。 i wish that true speech inputoutput system would be invented one day。 they have much knowledge in every field。 for example, if i want to, i can skip some chapters so that i can study at my own pace。 puters will continue to evolve(發(fā)展)with the aid of modern technologies。