这个打开的过程是用一个垂直的渐变的扫出。
达格达拿起魔琴，在琴弦上用手重重地扫出三个庄严的弦音。
And the Dagda took his harp and swept his hand across the strings in three great, solemn chords.
可以考虑用铲雪机在路上除雪，清扫出一条道路来作为比喻。
An analogy would be to consider snow plows on the road, clearing a path.
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