Stone Hard Skin 岩石皮肤
Hard stone 硬岩 ; 硬石
as hard as stone 像石头一样硬
As hard as a stone 坚如盘石
a hard kind of stone 一种硬石
hard-as-stone 坚如盘石的
extra hard dental stone 超硬质牙科石膏
It really was frozen as hard as stone.
它真的冻得像石头一样硬。
What I do is that I select a hard stone hammer.
我要做的是，我选择一个坚硬的石锤。
A cave bat, which regularly lives on a hard stone ceiling, is more careful about its landing preparation than a bat more accustomed to landing in leafy treetops.
洞穴蝙蝠通常生活在坚硬的石头天花板上，它比习惯降落在枝叶繁茂的树梢上的蝙蝠要更小心地做好着陆准备。
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