卡西尼宇宙飞船获取的图像拼接后显示的土星六角星云团环绕在土星北极的巨大六角形云团几十年来一直困惑着科学家们。
A giant hexagon circling Saturn's north pole has puzzled scientists for decades.
所有现场拼接都用美国材料试验协会的A325六角形头螺栓。
All field splices were bolted using ASTM A325 hex head bolts.
所有现场拼接都用美国材料试验协会的A325六角形头螺栓。
All field splices were bolted using ASTM A325 hex head bolts.
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