然而，通过光谱学测量，宇宙中氦的数量表明，宇宙中重子的数量要比基于星系光度所估计的要多得多。
However, the amount of helium in the universe, as measured by spectroscopy, suggests that there are far more baryons in the universe than estimates based on galactic luminosity indicate.
当前我们对太阳光度的认知是：在地球的历史进程上，太阳光度应该是逐渐增加而不是减少的。
Our present understanding of the Sun's luminosity holds that it should have progressively increased, not decreased, over the course of Earth's history.
采用紫外分光光度法测定了芫荽籽中总黄酮的含量。
The flavonoids in Coriandrum seeds were determined by ultraviolet spectrophotometry.
基于特定的旋光度值和糖成分，已经评估了ASP的几种化学和物理性质。
Several chemical and physical properties of ASP have been evaluated based on specific optical rotation values and sugar composition.
利用原子吸收分光光度法对中药川芎中锌、锰、铁、钙、镁五种元素的形态进行了研究。
Speciation of Zn, Mn, Fe, Ca, Mg in Ligusticum wallichii Franch was analyzed by atomic absorptionspectrometry.
具体来说，光度与半径的平方呈正比。
银河系外的有些星体其光度超过太阳。
天文学家用星等和光度来描述恒星的亮度。
Astronomers describe star brightness in terms of magnitude and luminosity.
在我看来，他曝光度越低越好。
在美国消费者中相对高的曝光度。
恒星在MK系统下，也经常根据光度分类。
Stars are also classified by their luminosity under the Morgan-Keenan system.
博客是提高搜索曝光度的首选工具
这两个元素一起决定着你相片的曝光度。
Together, these two elements determine the exposure of your photograph.
夜间合适的曝光度是多少？
要记住，感光度(iso)同样是因素之一。
他们将拥有更高的曝光度，那意味着更多流量。
通过光度与光谱证据，也许还能发现森林和草原的痕迹。
There will be photometric and spectroscopic evidence for forests and savannahs.
今天的相机能够将感光度调到3200并且成像效果很好。
Today's cameras routinely go up to ISO 3200 and deliver great image quality.
摄影小贴士：在高对比度的情况下，设置照片的曝光度时要小心。
Photo Tip: When photographing in a high contrast situation, consider your exposure carefully.
该榜的评选标准包括经济影响力、媒体曝光度以及职业成就等因素。
The list is based on factors such as economic impact, media reach and career accomplishments.
该榜的评选标准包括经济影响力、媒体曝光度以及职业成就等因素。
The list is based on factors such as economic impact, media reach and career accomplishments。
当用长曝光拍摄的时候，用一个低的感光度可以减少可能出现的像差。
Using a low ISO setting will help reduce the aberrations that can appear when photographing with long exposures.
关注当地的新闻动态可以帮助你发现一些曝光度不那么高的工作机遇。
Staying on top of local news can often help you spot opportunities that aren't advertised anywhere.
再次切换到工具箱的减淡工具，将范围设置为中间调，曝光度为15%。
Now switch to the dodge tool, located in the toolbox, and set to 'Range: Midtones' and' Exposure: 15% '.
一个完整的MK系统代号包含光谱类型和光度型两部分——例如，太阳属于G 2 V类恒星。
A complete MK designation includes both spectral type and luminosity class -for instance, the sun is a G2V.
如果存在三聚氰胺，将会形成一种沉淀物质，这也可以同时通过肉眼观察和分光光度法进行判断。
If melamine is present, a precipitant is formed, which can also be assessed both visually and by spectrophotometry.
如果存在三聚氰胺，将会形成一种沉淀物质，这也可以同时通过肉眼观察和分光光度法进行判断。
If melamine is present, a precipitant is formed, which can also be assessed both visually and by spectrophotometry.
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