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.
本标准描述了外部锁定型光控器之间的光度控制方法。
This standard describes methods of light level control between an external locking type photocontrol.
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。
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.
银河系外的有些星体其光度超过太阳。
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.
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。
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。
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.
他们将拥有更高的曝光度，那意味着更多流量。
这个活动应该简单，局部的，并能够增加团体的曝光度。
It should be simple, local, and increase the group's visibility.
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.
另一个提高你活动曝光度的活动是同时奖励个人和慈善组织。
Another way to increase your campaign’s exposure is to reward individuals as well as the charity.
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。
如此做来，你开始学习如何使用闪光，调节感光度差值，以及白平衡。
In doing so, you learned to control the flash, the ISO value, and the white balance.
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.
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.
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