don't produce results 结果却一无所获
America spends more on health care than other countries, but those expenditures don't seem to produce uniformly superior results.
美国在医疗上比别的国家花费更多，但是这些更多的开销似乎并没有带来对应的、更好的结果。
Light painting, also known as light drawing or light graffiti, can produce some truly stunning results but don't be fooled, it isn't as simple as just waving a little light in front of a lens.
光线喷涂，也称之为光线绘画或光线涂鸦，确实能够产生一些令人称奇的结果，但是不要被其表面蒙住了，它可不是仅仅在镜头前挥动一些光线那么简单。
Sadly, most of them don't work or they only produce short-term results.
令人遗憾的是，它们中的大多数都不起作用，或者只具有短期效果。
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