据运输部估计许多货运列车已经超过他们理论上的运载能力，从而使铁路运输交通变得拥挤不堪。
The Department of Transportation estimates that many are already exceeding their theoretical capacity and are congested.
最近的发现有力地支持了这样一种理论，即银河系中心，和宇宙中估计存在的1000亿个其他星系中的许多里有一个黑洞。
Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.
“估计还会出现许多严重的临床感染病例。”研究人员说。
"Much remains to estimate the clinical severity of infection," say the researchers.
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