采用压痕法及扫描电镜观察，研究了抗磨贝氏体球铁中裂纹的形核与扩展。
Crack nucleation and propagation in wear-resistant bainite ductile cast iron were investigated by press trace method and SEM.
最受欢迎的方法是所谓的贝氏(Bass)刷牙法，集中在牙齿的三分之一最接近牙龈线和牙龈本身的地方，那里是牙菌斑容易集中的地方。
The most popular technique, called the Bass technique, concentrates on the third of the tooth nearest the gumline and the gum itself, where plaque tends to concentrate.
开始刷牙，把豆粒大小的牙膏置于牙刷上，然后用贝氏(Bass)法涵盖你口腔中所有牙齿的所有表面。
To brush your teeth, put a pea-sized drop of toothpaste on your toothbrush, then cover all the surfaces of all the teeth in your mouth, using the Bass technique.
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