These things run for variable amounts of time because they take input, a list of size of some amount.
而这一段的执行时间是可变的,因为它们需要输入一个包含一些元素的列表。
And two, to give you a better sense of design especially as your programs get a little more involved and they play or they run for more than just a few seconds time.
另一方面,使你们对设计更有感觉,尤其是你的程序要适用于更多的应用环境或,要运行不止几秒钟时间的时候。
If I can run the gel for some period of time, run the electrical field, spread it out.
我将凝胶通电一段时间后,在电场作用下,就会分散开来
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