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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As a side effect of rules 1 and 2 above, one should expect a migration to be a trial and error process to be done iteratively until a satisfactory result has been achieved.

作为规则1和规则2所产生的副作用，您应当期望移植操作是一个需要被迭代完成的试验和错误过程，直到得到一个满意的结果为止。

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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