The photographs actually show sand dunes coated with a thin layer of frozen carbon dioxide, or dry ice, less than 240 miles from the planet's north pole.
这张图片实际显示的，是距离火星北极不足240英里的沙丘上覆盖的一层薄薄的冰冻二氧化碳、或干冰。
In the hot season, especially in hot dry areas and the thin layer Xiangyang construction, need water retention of high quality HPMC hydroxypropyl methyl cellulose slurry to improve.
在高温季节，尤其是炎热干燥地区及向阳面的薄层施工，需要高品质的HPMC羟丙基甲基纤维素提高浆料的保水性。
Wash affected area and dry thoroughly. Apply a thin layer over affected are twice daily (morning and night).
清洗干净受影响的部分并彻底擦干，每天早晚涂薄薄一层在受影响部分。
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