一旦更新完成，解锁这个表并使用 logger() 记录这个事务。

Once the update is completed, the table is unlocked and this transaction is logged with logger().

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给出，文件、记录加锁解锁的方法及解决死锁问题的途径。

Methods of file locking and record locking or file unlocking and record locking or file unlocking and record unlocking were given.

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玩家可以驾车在赛道上重复飞驰，提升赛车技巧，不断突破记录，赢得奖牌，解锁新的赛道---发掘新颖别致的，令人惊异的赛车。

Players can drive through re-playable tracks, develop their skills, improve their times, earn medals, unlock new tracks –and new special, surprising vehicles.

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