为了使调制解调器有时间在准备回叫时进行重置，客户端将延迟操作。
The client is delaying in order to give the modem time to reset itself in preparation for callback.
换句话说，doh得知异步测试是通过还是失败的惟一途径就是：操作是否在延迟操作上被调用了。
In other words, the only way the DOH knows an async test passed or failed is if an operation is invoked on the Deferred.
如果启用，则ejb容器会将数据库操作延迟到事务提交时处理。
If so, the EJB container delays database operations until transaction commit time.
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