• 1. Hard stone: 硬岩 | 硬石
• 2. as hard as stone: 像石头一样硬
• 3. As hard as a stone: 坚如盘石 | 铁石心肠

更多释义

• 1.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。
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• 2.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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• 3.Can spark, often on the hard stone.
  才能的火花，常常在勤奋的磨石上迸发。
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