In the end, advertising is a trial-and-error process.

最后，广告是一个试错过程。

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"This is a trial-and-error process," Dr. Koufman said. "Grains are good, and almost all the vegetables."

“这是个需要不断摸索，反复试验的过程”考夫曼博士说，“谷物和几乎所有的蔬菜都是很好的食品。”

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There is no question that the trial-and-error process of building machines and industries has, over the centuries, resulted in the loss of much blood and many thousands of lives.

当然采用实验而后发现错误进行建造机器和工业过程是没有问题的，在过去的几个世纪中，有过无数血的教训。

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Chemically altered antibiotics are typically thrown at the disease in a sort of trial-and-error process to see what works.

FORBES: Kosan races Maxygen, Diversa to new drugs

Likely this is not just a one-time, start-to-finish exercise, but an iterative process of trial and error.

FORBES: Are You Making Something Usable? Part 5 -- What to ask?

This uses a process of randomisation and trial-and-error (akin to mutation and selection in biological evolution) to search the vast number of possible microstructures to find the most suitable design for each subsection.

ECONOMIST: MONITOR