脉冲延迟量和超前量比损耗系统大，可用于光速控制，克服了微环带有损耗时产生的光强损耗和脉冲畸变。

These results show that the resonator with gain can be used to control the speed of light and to overcome the pulse loss and distortion in dissipative resonators.

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选择交流电作为工业标准的原因很简单，在早期供电距离很短的电网里，交流电的损耗比直流电小。

The reason was that over the short distances spanned by early power grids, AC transmission suffers lower losses than DC. It thus became the industry standard.

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对于摄影两个都不是最佳选择，因JPG比无损耗png小得多，也只是最低程序损失一点画质。

Neither are optimal options for photography, as JPG is much smaller than lossless PNG with only minimal loss of quality.

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