A pessimistic locking strategy assumes that the probability is high that another user will try to modify the same row in a table that you are changing.
悲观锁定策略的前提是，另一个用户很可能试图修改您正在修改的某个表行。
2
The bottom row of this table tells that the probability of obtaining a T value this large by chance is very low.
这张表的最后一行指出获取这样大 T值的 随机概率非常低。
3
By using the methods of table lookups, probability quantization and modified renormalization operations, a simple multiplication-free binary block arithmetic coding scheme is given.