If you do something on thefly, you do itquickly, often while you are doing somethingelse, withoutpreparingand withoutthinkingtoo much about how it should be done:
未经准备或较多考虑就开始匆忙做…（往往与其他事情一起进行）
This newruleseemsto have beencreatedon thefly.这一新规则似乎未经考虑就匆匆制定了。
computingspecialized
withoutinterruptingacomputerprogramthat is alreadyrunning:
无需中断一个已经运行的电脑程序（而同时执行其他功能）
He had written aprogramthat couldtranslatefromJapaneseon thefly.他写了一个程序，可即时翻译日语。
SMART Vocabulary: related words and phrases
Not expected or planned
abruptly
abruptness
ad hoc
ad hocism
ad hockery
extemporize
hoof
inconceivably
innocent
innocently
instinctive
instinctively
spirit
spontaneity
spontaneous
spontaneously
steepness
unannounced
unwitting
unwittingly
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