形容詞 presto:

1. (of tempo) very fast

副詞 presto:

1. suddenly- Swift
2. at a very fast tempo (faster than allegro)

1. I just turn the piece of wire in the lock and hey presto, the door open.
   我把金屬絲伸到鎖孔里一擰，嘿，那門就開了。

pres.to

adv.（副詞）
Music In a very fast tempo, usually considered to be faster than allegro but slower than prestissimo. Used chiefly as a direction.
【音樂】 急板地（的）：非常快的節(jié)奏，通常被認為是快于慢板而慢于最急板。主要用作演奏演唱指示
So suddenly that magic seems involved; right away.
一轉(zhuǎn)眼：如此之快似乎有神奇力量在作用；立刻，立即
n.（名詞）
【復(fù)數(shù)】 pres.tos 【音樂】
A passage or movement that is performed presto.
急板樂段或樂章

來源：
Italian
意大利語
from Late Latin praestus [quick]
源自 后期拉丁語 praestus [快的，迅速的]
from Latin praestô [at hand]
源自 拉丁語 praestô [立刻，立即]

【引伸】
pres.to
adj.（形容詞）