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It is necessary to apply unitary scale of hardness in practice.
实际应用中使用统一的硬度标度是必要的。
youdao
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Sapphire has a hardness of 9 on the Mohs scale and is also extremely tough.
蓝宝石具有硬度大、9月的层数也非常强硬。
youdao
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Sapphire has a hardness of 9 on the Mohs scale and is also extremely tough.
蓝宝石具有硬度大、9月的层数也非常强硬。
youdao