问题描述：
英语翻译
The two violas start the first movement with a vigorous subject in close canon,and as the movement progresses,the other instruments are gradually drawn into the seemingly uninterrupted steady flow of melodic invention which shows the composer's mastery of polyphony.
The two violas start the first movement with a vigorous subject in close canon,and as the movement progresses,the other instruments are gradually drawn into the seemingly uninterrupted steady flow of melodic invention which shows the composer's mastery of polyphony.
问题解答：
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