The behavior of a galaxy's dark matter halo could affect its evolution and help determine whether it becomes a spiral or an elliptical, they added.

科学家们补充说，星系的暗物质晕可能会影响到星系自身的演化过程并决定星系的形态——椭圆状或者是涡旋状。

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Note that each cylinder is contained within a spiral that represents an evolution.

注意到每个圆柱都包含于表示演进的螺旋中。

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Objective to observe spiral ct pulmonary angiography (CTPA) signs of pulmonary embolism (PE) and the evolution of PE, to evaluate CTPA in differentiating acute PE (aPE) with chronic PE (cPE).

目的观察肺动脉栓塞(PE)的螺旋CT肺动脉造影(CTPA)征象及其演变，探讨CTPA区分急、慢性PE的价值。

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