渗氮在钢表面获得远远超出正常标准的硬度。其硬度范围为900到1,100布氏硬度，这远高于普通表面硬化所获得的硬度。
Nitriding develops extreme hardness in the surface of steel. This hardness ranges from 900 to 1,100 Brinell, which is considerably higher than that obtained by ordinary case hardening.
大便的粗细和硬度正常，且从未呈黑色。
Thee stools were of normal caliber and consistency and have never been black.
结论介入超声印压能够区分活体犬梗死心肌与正常心肌之间的硬度差异。
Conclusion Trans-arterial ultrasound indentation catheter can be used to distinguish the stiffness variance between myocardial infarction and normal myocardial of canine in vivo.
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