疲劳断口有应力发白现象；应力发白区为疲劳裂纹形核和萌生区，其寿命占疲劳总寿命的大部分；
The stress whitening can be clearly seen on the fatigue fracture surface and its region is the initiation and nucleation of fatigue crack which is the main part of total fatigue life.
避免在阴雨季节、空气湿度高的天气进行施工。尤其是在湿度高的天气进行喷涂易造成涂膜发白现象。
In the rainy season 6, avoid, air humidity high weather for construction. Especially in high humidity weather for spraying easy cause film white phenomenon.
亚临床感染病损用3%—5%醋酸液局部外涂或湿敷5—10分钟，感染区可发白，即所谓醋酸白现象。
Subclinical infection lesion with 3% - 5% acetic acid solution with topical or wet compress 5 to 10 minutes, the affected area can be white, the so-called Acetowhitening phenomenon.
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