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.
年龄相关的黄斑退行性改变可能存在的体征包括：中心视觉丧失（在视野中央看到一个黑斑）、视物变形或视力模糊以及看到波浪状的垂直线。
Possible signs of AMD include a loss of central vision, seeing a dark spot in the center of the field of vision, distorted or blurred vision, and wavy vertical lines.
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.
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