Most galaxy associations are small and have a low density contrast.
大多数星系协是小的，密度反衬低。
Polyurethane is a low density, flexible foam that offers good shock absorbency and resiliency.
聚氨脂是可提供良好冲击吸收和弹性的低密度的弹性泡沫。
A low density polyethylene produced by a low pressure process, by Ziegler-Natta polymerization or by use of the Phillips process.
采用低压过程，齐格勒·纳塔聚合或菲利浦斯公司工艺生产的一种低密度聚乙烯。
The results showed that conductive composite particle has a low density and good conductive performance, which can meet the demand of conductive adhesives.
结果表明：制备的导电微粒密度小，具有良好的导电性能，可以满足各向异性导电胶应用需求。
A low density cement slurry of zero thickening transition period which was appropriate to low temperature and shallow flow cementing operation in deepwater was introduced.
介绍了一种新型的用于海洋深水低温浅层流固井作业用的零稠化转化时间低密度水泥浆体系，该水泥浆体系采用新型高强快速凝固水泥制备。
Air has a low density and great compressibility. The volumetric flow rate of air in air drilling varies with pressure and temperature, which in turn, change with WLL depth.
气体不仅密度低，而且具有很大的可压缩性，所以空气钻井的体积流量将随压力和温度变化，而压力和温度又随井深变化。
The interaction between an ultra-short ultra-intense laser pulse and a solid target with a low density pre-plasma is examined. Both linear and circular polarizations of the laser are considered.
对线极化、圆极化的超短超强激光脉冲与靶前有一段低密度预等离子体的固体靶的相互作用进行了理论和粒子模拟研究。
Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars.
尽管它的视觉效果如此显著，但尘埃只是位于恒星之间的物质的一个次要组成部分，其密度极低。
Half a century of town and country planning has enabled it to retain an enviable rural coherence, while still permitting low-density urban living.
半世纪以来，合理的城乡规划使英国得以保留令其他国家羡慕的乡村协调性，同时还允许低密度的城镇人口。
Grapes have a low energy density - 1 cup of grapes has about 104 calories.
葡萄的能量密度低，一杯葡萄含大约104卡路里。
They found a strong association between those whose autobiographies had low idea density and presence of the Alzheimer-related tangles in the frontal, temporal or parietal lobe of the brain.
研究人员发现，自传中内容密度低的修女，其大脑前部顶叶出现痴呆混乱的情况也增多，二者有密切联系。
Just as it is sometimes useful to speed up to move quickly through writing with a low information density, you often need to slow down to catch the important or confusing bits.
有时候你需要快速浏览过一些信息密度很低的内容，但对于一些重要或感到困惑的内容则应该慢慢读。
Three main factors play a role in what makes food high or low in energy density.
决定食物能量密度高低的因素主要有三个。
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.
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。
The firm says the low power-density of its lasers and a series of safeguards ensures that human exposure remains within regulatory limits.
公司称他们的低能量密度激光和一系列防护措施能保证暴露在其中的人体处于安全范围之内。
This is a low energy-density device, which stores electricity directly by charging two conductive plates with static.
（和电池相比，）这是一种“低能量密度”设备，电能被直接存储在两块静止的导电板上。
With each new measurement, Pluto got lighter and tinier, until astronomers realized that the object is in fact smaller than Earth's moon and has a very low density.
用各种测量方法重新测量后，冥王星变轻了、变小了，这时候天文学家才意识到冥王星实际上还不如月球大，并且密度也很小。
A continuous ramp winds up the tower with low, medium and high density residential units attached.
一个不间断的斜梯缠绕着整个塔，将低密度、中等密度和高密度的住宅单位串联起来。
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.
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。
There were just two problems: it had a lower energy-density than cobalt oxide and suffered from low conductivity, limiting the rate at which energy could be delivered and stored by the battery.
只是存在两个问题：它的储能比钴氧化物要低，而且导电率也较低，这限制了电池释放和存储能量的速度。
Because the second kind, low-density lipoprotein (LDL), get smaller and smaller until they're tiny enough to enter the walls of your blood vessels and attach themselves like a bad houseguest.
因为还有第二种胆固醇，即低密度脂蛋白(LDL) LD L变得越来越小直到他们足够小能进入血管壁，然后依附在血管壁上。
While Burchard was experimenting with refrigerator insulation, he came up with a novel way of molding low-density foam.
那年伯查德正在做有关冷冻机隔热材料的实验，实验中他使用新的方法做出一种低密度的泡沫材料。
The introduction of a special contracting system for health workers was a successful approach to reopening health posts in regions with low health workforce density in Senegal.
推出医疗工作者特别承包制让塞内加尔在缺少医疗工作者的地区成功地重新开设了卫生站。
Good power density means a shape like a peanut butter jar, easy to fill or empty; low power density is more like a wine jug with a narrow neck.
电能密度好的就像花生酱罐子口，很容易装满或倒空；电能密度差的就像窄瓶口的酒壶。
There’s also a region of low-density that could be a section of the hominid’s brain.
还有些低密度区域，很可能是原始人的大脑。
Following a lifestyle that decreases LDL (low-density lipoprotein) and increases HDL (high-density lipoprotein) is the primary path to lower cholesterol.
在日常生活中，人们一般把降低低密度脂蛋白ldl和增加高密度脂蛋白hdl当作是降低胆固醇的主要的路径。
Following a lifestyle that decreases LDL (low-density lipoprotein) and increases HDL (high-density lipoprotein) is the primary path to lower cholesterol.
在日常生活中，人们一般把降低低密度脂蛋白ldl和增加高密度脂蛋白hdl当作是降低胆固醇的主要的路径。
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