测试寄存器是个特殊锁存，可以保存alu中比较所得的值。
The test register is a special latch that can hold values from comparisons performed in the alu.
这书桌有把特殊的锁。
在有些非常特殊的场合下（挂起的分布式事务）读取数据需要等待改写数据产生的锁的释放。
Readers of data may have to wait for writers of the same data blocks in some very special cases of pending distributed transactions.
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