每一种操作都具有前提和后期条件，并且它们能够提出例外。
Each of these operations can have preconditions and post-conditions, and they can raise exceptions.
当然，这三种操作符(单引号、双引号和反撇号)都有合法的用途，但是与英语中的例外一样，记住和掌握这些细微差异很令人头疼。
Certainly, all three operators-the single, double, and back quotation marks-serve a valid purpose, but like exceptions in English, memorizing and mastering the variations can be maddening.
一个例外是在执行mount命令时指定了direct _ io选项(这于read操作的情况类似)。
An exception to this is when the direct_io mount option is specified (as in the read operation).
这种结构惟一的例外是，当URL路径是 /node/add或 /node/add/
The only exception to this structure is when the URL path is /node/add or /node/add/
因此，您对测试程序所做的操作可能是成功的，但是它们可能并不是简洁的，因为日志文件中有例外情况及警告的存在。
Therefore, your operations on the application under test might be a success, but they might not be clean because of the exceptions or warnings in the log file.
不过这条规则也有一个惟一的例外，那就是日志抢救操作，这种操作再次用相同的对象名称来备份已经被保存的逻辑日志，从而使得前一个版本进入不活动状态。
The exception to this rule could be a log salvage operation where already saved logical logs are backed up again with the same object name, thereby inactivating the previous version.
当两个快照是由于单个安装或配置操作导致时例外。
The exception is those situations where two snapshots are taken as the result of a single install or configuration action.
就算已经知道了做JNDI查找的序列，处理 JNDI例外的操作会添加一系列标准代码。
Even though the sequence of doing the JNDI lookup is well known, casting and handling the JNDI exception adds a lot of standard code.
例外的是控制元件测试。在此过程中仍可以操作音量调节器。
By way of exception the test of the control-unit, the volume regulator can be adjusted.
例外：如果球员因为在错误的地点进行击球而受罚，则不再根据未经允许进行替代球操作而额外受罚。
Exception: If a player incurs a penalty for making a stroke from a wrong place, there is no additional penalty for substituting a ball when not permitted.
例外：如果球员因为在错误的地点进行击球而受罚，则不再根据未经允许进行替代球操作而额外受罚。
Exception: If a player incurs a penalty for making a stroke from a wrong place, there is no additional penalty for substituting a ball when not permitted.
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