问题是目前用于测量密度的仪器，不是要求有高的精密度，就是要求要便于携带。
The problem is that existing devices for measuring density tend to be either precise or portable.
后来，其他研究人员测量了密度差，发现了一个显著的差异。
Later, other researchers measured the density differential and found a significant difference.
可以使用双能X 射线吸收仪测量下颌角和股骨区的骨密度。
The bone density of the mandibular angle and coxofemoral region can be measured with dual-energy X-ray absorptiometer.
研究者还特别留意了女性们前额以及脸颊皮肤的紧实度，并且运用X光测量了骨质的密度。
They also noted the firmness of the skin on the women's foreheads and cheeks, and used X-rays to measure the density of their bones.
例如，通过测量基本音高来测量宇宙的密度。
For example, by measuring the basic pitch, you measure the density of the universe.
之后他测量了热通过碳管的方式并发现流动在倾向低密度的方向最大。
He then measured the way that heat passed along the tubes and found that the flow was greatest towards the "low density" ends.
他们还能通过测量空间几何推断出宇宙中能量和物质的总密度，并推算暗能量的总和。
They can also measure the geometry of space. That allows them to deduce the total density of energy and matter in the universe and infer the amount of dark energy.
要分辨一种物质，可以用密度测量法。而无须借助费事繁琐的化学分析法。
One way to identify a substance without resorting to fiddly chemical methods is to determine its density.
密度测量结果意味着这些物质一定是水晶，而被许多人珍视的钻石，实质是碳元素的单质晶体。 也就是说，那颗行星的大部分可能都与钻石类似。
The density means that this material is certain to be crystalline, that is, a large part of the star may be similar to a diamond.
利用1857颗恒星的光线，一个由来自法国和美国天文学家组成的研究小组通过测量星光之间的细微差距来测定太阳周围气体的密度。
Using the light from 1, 857 stars, a team of French and American astronomers were able to measure the density of the gas surrounding our sun by examining fine differences in the starlight.
太阳探测杯（The Solar Probe Cup）会收集一些日冕和太阳风去持续地测量速度、温度和密度等数据。
The Solar Probe Cup will scoop up bits of the sun’s corona and solar wind to continuously measure its speed, temperature and density.
人们可以测量思想的速度，就像测量岩石密度一样，这样的观点确实有点骇人。
The notion that the speed of thought could be measured, just like the density of a rock, was shocking.
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。
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.
为了验证这一想法，研究人员又测量了志愿者指尖的汗毛孔密度，因为他们知道触觉受体细胞总是聚集在汗毛孔周围的。
To test the idea, the researchers measured the density of sweat pores. Because they knew that touch receptor cells cluster around sweat pores.
经过为期12个月的过程，研究人员测量了病人们的血糖、低密度胆固醇、血压以及抑郁水平。
Over the course of the 12-month program, the researchers measured the patients' blood sugar, LDL cholesterol, blood pressure and levels of depression.
没有卫星就意味着我们无法算出行星的密度,于是测量也就凝滞不前了.
No moon means we can't work out the density of the planet, so the whole thing grinds to a halt.
这种光谱调制传感器系统能够测量多种物理参数，如压强、温度、气体密度及多种化学成份。
The spectral modulation sensor system can detect and measure various physical parameters such as pressure, temperature, gas density, and various chemical species.
身材变矮可以提醒医生注意其他检查，尤其是测量腕骨或髋骨密度的检查遗漏的骨质疏松问题。
Height loss can alert doctors to osteoporosis that other tests miss, particularly those that measure bone density in the wrist or hip.
详细地讨论了微分吸收激光雷达测量气体密度时中心频率的漂移所引起的测量误差。
The measurement error of differential absorption laser radar caused by the shift of its center frequency in measuring atmosphenc density has been discussed particularly.
他说，不同密度的海水产生不同的能量，辐射计测量海水的微波辐射，科学家依靠这些微波用数学公式计算海水的盐分水平。
He says different intensities of saltwater produce different energy. The radiometer measures microwaves from the water.
研究者称：通过对671名平均年龄是55岁的妇女的研究发现，他们有能力在骨密度测量同样程度下预测骨质疏松症的情况。
Looking at 671 women with an average age of 55, the researchers said they were able to predict osteoporosis conditions to the same extent as the bone density measurements.
可以快速方便测量各种形状的固体的密度，配置专业的测量配件，透明水槽。
Solid can be fast and convenient measurement of various shapes of density measurement accessories, configuration of professional, transparent water tank.
石灰岩具有相同孔隙度测量值，而湿砂岩将导致中子孔隙度的读数偏低，密度孔隙度读数偏高。
Limestone will have the same porosity measurements, whereas a wet sandstone will cause the neutron porosity to read low and the density porosity high.
现有的密度补偿模型不适合高温高压饱和蒸汽的流量测量，密度补偿精度较低，导致蒸汽流量测量误差较大。
The existing density compensator model does not fit high temperature and pressure saturated vapor, the density compensator precision is low and causes big error in saturated vapor measurement.
海绵密度测定仪是领先的固体密度测量仪器。
The sponge density measuring instrument is a solid density measuring instrument leading.
研制成功一种光纤烟气传感器，用于测量烟气的光学密度。
A kind of optical fiber smoke sensor which is used to measure the optical density of the smoke is introduced.
在以前的研究中，宾大研究人员已经证实测量hdl外排能力可能是一个比单独测量高密度脂蛋白(HDL)水平更有效的预防心脏疾病的晴雨表。
In a previous study, researchers at Penn have demonstrated that measuring HDL efflux capacity may be a more effective barometer of protection from heart disease than measuring HDL levels alone.
超导体的转变温度和临界电流密度是两个经常要测量的参数。
A superconductor's transition temperature and critical current density are two commonly measured parameters.
分析的准确度与精密度有何区别？我们又分别如何测量他们？
What is the difference between analytical accuracy and analytical precision and how do we measure each of these?
分析的准确度与精密度有何区别？我们又分别如何测量他们？
What is the difference between analytical accuracy and analytical precision and how do we measure each of these?
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