然而，要到达26万亿英里之外的半人马座阿尔法星，携带和储存足够量的反物质难度极大，这种燃料不仅状态不稳定，而且耗资不菲。
However, getting enough antimatter for the 26 trillion-mile, one-way trip to Alpha Centauri and storing such a volatile fuel for long periods is prohibitively expensive and difficult.
这个生物质是在一个连续的分解状态下，最后生成了一种半稳定的物质叫做腐殖质。
This biomass material is in a continuing state of decomposition, ultimately becoming that semi-stable material called humus.
发现供水状态变化后，地板表面温度随时间呈指数变化，升温期的稳定时间约为降温期的一半。
It is found that the floor surface temperature variety exponentially with time after the change of water condition, and the heat lag in the heating period is about half of that in cooling period.
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