It enables the user to control the speed and sound levels of orchestral music playing on a computer.
VOA: special.2011.05.11
Even those of you who've taken AP computer science or something similar perhaps recall that even just getting a piece of input from the user is ridiculously not obvious.
你们中上了AP计算机科学这门课,或者类似的课程的人可能还记得,即使只是从用户那里得到一个输入,也相当麻烦。
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