Transaction 1 reads a specific record and places a lock on that row.
事务1读取某条特定记录并对该行应用一个锁。
Similar to Figure 1, transaction 1 reads a specific record but then releases its lock.
与图1类似，事务1读取某个特定记录，但随后即释放锁。
Similar to Figure 1, transaction 1 reads a specific record but then releases its lock.
与图1类似，事务1读取某个特定记录，但随后即释放锁。
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