Parallel intervals of a fifth, octave or unison are traditionally prohibited in four-part writing.
五度，八度或一度音程平行传统上在四声部作品中禁用。
Arrange the troopers with intervals in two parallel lines and cause them to advance as if to pass through the intervals, first at guard and later at charge saber.
让骑兵面对面交替排成两条平行线并使他们相对前进，好像要穿过彼此间的间距，首先采取防卫姿势，接着是冲锋姿势。
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