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1·The scherzo is marked allegro molto.

谐谑曲是很快的快板。

2·So it consists mainly of semi-quaver runs, but Mozart writes at the heading, molto allegro making it more difficult to play and then very short notes so the pianist is really sweating hard.

该乐曲主要是由十六分音符组成，但莫扎特在开头部分写下的节奏飞快的音符使弹奏该曲变得颇有难度，而有些音符则非常短促有力，所以将演奏者累得大汗淋漓。