最近的天文观测表明，宇宙是在加速膨胀，而不是原来认为的减速膨胀。
Recent astronomical observations indicate that expansion of our universe is speeding up, rather than slowing down.
通过分析，针对混凝土材料，提出了可给出弹体减速度时间历程解析解的法向膨胀理论。
For concrete material, a normal expansion theory was proposed by which some deceleration about time history of the projectile can be analytically given.
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