人们只得在交叉路口设立标志,要求司机减速、让路。
The permissions sets of the caller class and its ancestors (that is, all stack frames above this one) are not included in computing the intersection set.调用类和它的上级(即所有在它 上面的堆栈帧)的权限集都 不包括在交集计算中。
The basic algorithm for arriving at the final, applicable set of permissions is to compute the intersection of all Pis.最后得到的一组适用权限的算法是要计算所有权限的交集。