过去许多探测低密度气体的努力都受到了阻碍。
The low density of the gas hampered many attempts to detect it in the past.
10年前，科学家们预言大约有一半由原子组成的“丢失”了的普通物质，以低密度气体的形式存在于星系间广阔的空间中。
10 years ago, scientists predicted that about half of the missing 'ordinary' or normal matter made of atoms exists in the form of low-density gas, filling vast Spaces between galaxies.
在两幅图中，气体密度越高的区域颜色也就越深，低密度区则更浅。
In both cases, high concentrations of the gas are dark, while low concentrations are light.
介绍了一种新型的化学发泡气体充填与固体充填减轻制备的低密度低温深水水泥浆体系，并对其在海洋深水环境下的性能进行了系统的室内评价研究。
A new low temperature and deepwater slurry system prepared with chemical foaming gas and solid packings, which can reduce the density of the slurry, is introduced.
优选适宜的发泡机头温度可以抑制气体逃逸，提高发泡倍率，获得更低密度的聚丙烯发泡材料。
To improve the volume expansion rate, lower the density of pp foam, gas escaping should be avoided by selecting the appropriate die temperature.
在低压储层进行欠平衡钻井时常选用气体型低密度流体。
Gas drilling fluid is often used in UBD in low pressure formation.
在低压储层进行欠平衡钻井时常选用气体型低密度流体。
Gas drilling fluid is often used in UBD in low pressure formation.
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