- 石(stone; rock)
- 更(change; firm)
Hard as stone, immovable and unchangeable.
hardness
This material has very high hardness.
hardness
This material has very high hardness.
Hard as stone, immovable and unchangeable.
Under a roof, use your hand to measure back and forth many times to get accuracy.
Hard as stone, immovable and unchangeable.
Under a roof, use your hand to measure back and forth many times to get accuracy.
hardness
hardness
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