The use of optical illusions as speed breakers was first pioneered in the American city of Philadelphia in 2008, as part of a campaign against speeding motorists.
2008年，作为防止机动车超速的举措之一，美国费城最先将视觉幻象用作减速装置。
With 680HVM Hydrocarbon gas analyzer produced by American Thermo Electric Com. , the optical working conditions and the leakage calculation mode of the analyzer are determined.
通过运用由美国热电子公司生产的680HVM型碳氢化合气体分析仪，确定了该仪器的最佳使用条件及泄漏量计算模式。
With 680HVM Hydrocarbon gas analyzer produced by American Thermo Electric Com. , the optical working conditions and the leakage calculation mode of the analyzer are determined.
通过运用由美国热电子公司生产的680HVM型碳氢化合气体分析仪，确定了该仪器的最佳使用条件及泄漏量计算模式。
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