Tests have shown over and over again that the sites with black text on a plain white background--with colors limited to the margins--get the highest conversion rates.

实验均表明，黑色文字白色背景，仅在边缘有色彩点缀的网站的转化率是最高的。

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So, it's feasible to reduce the cost of optical network by integrating PVWP with limited range wavelength conversion technique.

因此，通过将PVWP和有限波长转换技术结合来降低网络成本是可行的。

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The technology of manufacturing the wavelength converter with limited-range conversion range and the sparse distribution of the wavelength converter are under research.

由于技术和价格的限制，有限范围波长变换的研究和稀疏节点波长变换的研究应运而生。

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This year, moreover, there is an extra ingredient to consider: windfall payments from the conversion to public limited companies of big building societies and Norwich Union, a big insurer.

ECONOMIST: The confusing consumer

The cash windfalls from the conversion of mutual societies, mainly building societies (thrifts), into limited companies, which gave consumer spending a fillip in 1997, will not be repeated in 1998.

ECONOMIST: The economy