科学家们说这个理论可以解释一个长久以来的谜团：奇怪的火星黑斑，扇状结构和每年出现在火星南极附件的蜘蛛状图案。
The scientists say the theory may explain a long - standing mystery : strange dark spots, fanlike structures, and spidery patterns that appear near mars ' s southern pole every year.
科学家们说这个理论可以解释一个长久以来的谜团：奇怪的火星黑斑，扇状结构和每年出现在火星南极附件的蜘蛛状图案。
The scientists say the theory may explain a long-standing mystery: strange dark spots, fanlike structures, and spidery patterns that appear near Mars's southern pole every year.
从Johnson彗星的彗核（照片中部的黄色球体）向上延展的扇状区域描绘出了这颗彗星的尘埃“尾”。
The fan-shaped region that stretches upward from Johnson's nucleus (yellow ball in the middle) represents the dust "tail" of the comet.
活检的要点包括选择最佳层面和进针点，作多点扇状快速抽吸。
The key points of aspiration biopsy included selection of the appropriate cross-section.
一种成扇状分叉的电路。
一种成扇状分叉的电路。
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