Composers most frequently use the terms ritardando and accelerando to introduce rhythmic flexibility into their music .
大部分作曲家经常运用徐缓和渐快术语来引进有节奏的灵活性从而变成他们的乐曲。
Accelerando shows us a future in which copyright infringers are pursued by hitmen , while halting state depicts furtive back alley " fabbers " running their 3-d printers one step ahead of the law .