Spherical roller bearings are double-row, self-containing units that comprise solid outer rings with a concave raceway, solid inner rings and barrel rollers with cages.
球面滚子轴承是双列，自我包含的单位，包括坚实的外圈与凹面滚，固体和内圈与辊每桶笼。
2
If the trusted list is small (perhaps containing only one self signed certificate), this attack becomes very difficult.
如果受信任列表很小(或许仅包含自签署证书)，则发起此类攻击将很困难。
3
The self keyword points to the containing class and is unaware of subclasses.