请注意，目前的宇宙年龄是由宇宙当前的膨胀速率所估计的。
Note that the present age of the universe follows from the expansion history and present expansion rate.
文中提出了改善氧化镁品质、改进掺混工艺、研制具有不同膨胀速率的膨胀剂等意见。
Suggestions are made for improving the quality of MgO, improving the method of mixing MgO in the production of concrete and for producing expansive agents with different speed of expansion.
蒸气制冷剂产生减缓膨胀气体的膨胀速率的补强蒸气，从而将膨胀气体留存在金属表面上。
The vaporous cryogen creates a reinforcing vapor that slows the expansion rate of the expanding gas, localizing the expanding gas over the metal surface.
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