Roughness of the snow. The range is 0 (very smooth snow) to 1 (very rough snow). The default is 0.4.
积雪的粗糙度。范围从0(很平滑的积雪)到1(很粗糙的积雪)。缺省值是0.4。
The smooth Snow Queen feature is strongly suspected to be ice originally just under the soil, uncovered by the thruster rockets as Phoenix set down on the north polar plains of Mars.
因为冰后具有很平滑的表面，这也让大家很怀疑它本来是位在表土之下，当凤凰号降落在火星北极平原时，被火箭的喷气给清出来。
It seemed wrong to spoil the smooth Outlines of these snowdrifts and I hoped that nobody else would pass this way after me. In that case the thick falling snow would soon restore the damage.
这样做好像是不对的，会破坏这些雪堆流畅的线条，我希望后面不会有别人也走这条路，好让大雪很快就能把我造成的破坏掩盖起来。
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