通过制定循序渐进的市场机制，全球范围内主要城市的污染是可以控制的。
The pollution that occurred in major cities throughout the world has been controlled by progressive regulations.
在这一节中，我将谈到可以用来修改DB 2 V8.2.2为某些隔离级别而使用的ANSI标准锁机制的一些主要控制。
In this section, I'll cover some of the major controls that you can use to alter that ANSI-standard locking mechanism used by DB2 V8.2.2 for certain isolation levels.
但是，当同步主要是并发控制的机制时，则事务主要是处理异常的机制。
But while synchronization is primarily a concurrency control mechanism, transactions are primarily an exception-handling mechanism.
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