on the fly

基本解释

In this way, you can create objects that imitate having an infinite amount of methods on the fly.
通过这种方式，可以创建这样的对象，即动态地模拟拥有无数方法的情况。
These traces are applied on the fly, and they do not persist after restarts, but they can be useful in debugging.
这些跟踪会立即应用，并且在重新启动后不会保留，但是它们对于调试会非常有用。
You can compress archives on the fly with standard compression types, or specify an external compression program of your choice.
您可以通过标准的压缩类型来动态压缩归档文件，或指定一个自己选择的外部压缩程序。

Post would fly the plane. On June twenty-third,nineteen thirty-one, Post and Gatty took off from Roosevelt Field in New York.
What lambda that does, it creates on the fly a function, as the program runs. That I can then pass around.
这里的入是在函数运行的时候，由一个函数创建的，然后我会传递这个值。
麻省理工公开课 - 计算机科学及编程导论课程节选
So I am going to on the fly write a very simple little main program that just illustrates some of the syntax that we can then visualize more interesting.
我很快的写了一个很简单地小程序,来说明一些语法,我们使它变得更有趣些。
哈佛公开课 - 计算机科学课程节选

Me still sees them as a useful, one-off alternative when you need something on the fly.
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If you do something on the fly, you do it quickly, often while you are doing something else, without preparing and without thinking too much about how it should be done.
without interrupting a computer program that is already running