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。
Human teeth are harder than gold but softer than pyrite, according to the Mohs Hardness Scale, which categorizes how easily minerals scratch.
根据莫氏硬度表，人类牙齿的硬度比黄金大但比黄铁矿小。
Human teeth are harder than gold but softer than pyrite, according to the Mohs Hardness Scale, which categorizes how easily minerals scratch.
根据莫氏硬度表，人类牙齿的硬度比黄金大但比黄铁矿小。
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