1·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。
2·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。