乙醇作为一种生物燃料相对来说容易生产。但是与汽油相比它的能量密度较低，而且不能够通过现有的化石燃料管线来运输。
As a biofuel, ethanol is relatively easy to make, but it has a lower energy density than gasoline and can't be transported through existing pipelines designed for petroleum fuels.
昆虫和病原体是森林生态系统的固有成分，通常其密度相对较低，所造成的损害较小，对树木生长及其活力的影响微乎其微。
Insects and pathogens are integral components of forest ecosystems and normally are present at a relatively low density, causing little damage, and having negligible impact on tree growth and vigour.
研究人员们认为设计出了一种比乙醇的能量密度高出40%的生物燃料，而且它排斥水并能在制造速度上相对快捷。
The researchers think they have devised a biofuel that has a 40% higher energy density than ethanol, that repels water and that can be made relatively speedily.
储有石油的地方相对较少，因其能量密度、泵送能力及在内燃机上的易用性使其特别适宜成为运输燃料。
Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.
在总能源消耗方面排名第七，这绝大方面取决于该州作为该国人口数第三低相对人口密度。
It ranks seventh for total energy used, however this is largely the result of the state's relatively low population density, the third lowest in the country.
方法：邮政编码排名主要依据富裕退休人员(及接近退休年龄人员)的密度以及相对的生活费用。
Methodology: the Zip Codes were ranked based primarily on the concentration of affluent retirees (and people nearing retirement age) as well as relative cost of living.
不过，在媒蚊密度较高时，蚊虫向人传播病毒的相对重要性可能增加。
However, at times of high vector densities the relative importance of mosquito-to-human transmission may increase.
低密度的聚乙烯是PVC很好的替代品，它的生产过程相对简单，也不需要添加化学物质增加柔软性。
Low density polyethylene makes a nice substitute for PVC. It has a simple makeup and doesn't require additives to make it soft and pliable.
相对表空间权重(Relative tablespace weight)：访问密度和访问延时的函数。
Relative tablespace weight: a function of access density and access latency.
人口密度相对较高的国家换到了比较辽阔的地方，这样增加了这些国家在世界地图上的可见度。
Countries with relatively high population densities move to more spacious environments. This increases their visibility.
iPhone的像素密度比桌面电脑显示器要高得多，便于阅读小文本或更改图像的相对尺寸。
The pixel density of an iPhone is much greater than a desktop monitor, allowing small text to be read somewhat more easily and somewhat changing the relative size of images.
与之相对的是，小国马耳他（该国人口密度大，阳光充足，位于意大利附近的一个礁石岛）的可再生能源要达到的比例却仅为10%。
Yet tiny Malta (a sun-drenched but crowded rock near Italy) has been given a renewables target of just 10%.
将水引到小块农业用地的能力意味着霍霍坎人可以以相对高密度人口进行大规模的农业生活。
The ability to divert water into small agricultural plots meant that the Hohokam could live in large agricultural communities of relatively high population density.
由于密度是质量除以体积，相对密度和相对大小给予相对群众。
Since density is mass divided by volume, the relative densities and relative sizes give the relative masses.
这些地图显示了红树林的位置和相对分布密度，它们大约占据地球表面的137,760平方千米（53,190平方英里）。
These maps show the location and relative density of mangroves, which cover roughly 137,760 square kilometers (53,190 square miles) of Earth’s surface.
行星科学家们知道，水星密度极高——最可能的原因是相对于其它部分水星内核中铁含量非常巨大。
Mercury, planetary scientists knew, is uncommonly dense - most likely because its inner core of iron is very large relative to the rest of the planet.
这些地图显示了红树林的位置和相对分布密度，它们大约占据地球表面的137,760平方千米(53,190平方英里)。
These maps show the location and relative density of mangroves, which cover roughly 137,760 square kilometers (53,190 square miles) of Earth's surface.
科学家们相信，这将会导致那些易挥发的轻元素首先剥离，剩下相对高密度的行星。
This, scientists had reasoned, would make those volatile lighter elements the first to get stripped away, leaving the planet comparatively dense.
阿尔伯特.爱因斯坦在其广义相对论中对此已有预测，他指出密度极高，质量极大的物体相互靠近到一定程度时就会出现上述现象。
They were predicted by Albert Einstein as part of his theory of general relativity and expected to be generated whenever extremely dense and massive objects get too close to each other.
在这些运动员大脑中观察到的相对小的灰质面积和密度所代表的意义尚不清楚，研究者们说。
The significance of the relatively smaller gray matter volume and density seen in these players is not yet clear, the researchers say.
以素面镭射纸为例，通过实验，阐述了结合相对反差和色彩反差来确定印刷最佳实地密度的方法。
The method was illustrated by experiment on plain laser paper to combine relative contrast and color contrast to obtain optimum solid density of printing.
在忽略其他条件影响下，长径比相同的碳纳米管，电荷密度相对分布曲线趋势完全相同。
Without considering other aspects carbon nanotubes with the same aspect ratio have entirely uniform trend in charge density relative distribution curve.
对烧结样的相对密度、抗拉强度、延伸率等性能进行了测定与分析。
Relative density, tensile strength and elongation of samples were also measured and analyzed.
形态学的银河尚不清楚由于低恒星密度和相对距离较远银河(220,000光年)。
The morphology of the galaxy is not clear due to the low stellar density and the relatively short distance to the galaxy (220,000 light years).
他表示，就此次四川地震而言，由于震中附近主要是山区和偏远地区，人口密度较小，死亡人数将相对有限。
The death toll of the Sichuan quake would be limited by the lower population density of the mountainous and mainly rural areas near the epicenter, he says.
在石漠化严重的地区，人口密度、农户居住的聚集程度、单位面积上的劳动力数量等人口指标相对较低。
In serious rocky desertification area, the indexes of density of population, gathering degree of peasants, workforce quantity are relatively lower.
大多数天体物理学家接受这个情形，自从依照广义相对论，充份密度物质任何集中一定必然坍缩为一个黑洞。
Most astrophysicists accept that this is the case, since according to general relativity, any concentration of matter of sufficient density must necessarily collapse into a black hole.
同一时期，海洋散热较慢，温度相对地较高，空气密度变化较小，遂形成相对的低压区。
The same period, the ocean thermal slow, relatively high temperature, air density changes smaller solipsism relative area of low pressure.
同一时期，海洋散热较慢，温度相对地较高，空气密度变化较小，遂形成相对的低压区。
The same period, the ocean thermal slow, relatively high temperature, air density changes smaller solipsism relative area of low pressure.
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