Downloads the image at the given URL if not present in cache or return the cached version otherwise.
如果图片不存在缓存中，就根据给定url下载图片，否则返回缓存中的图片。
These waters present a disposal problem if they are not returned to the ground from which they were removed.
这些水如果不回到它们所被移出的地面，就会造成处理问题。
If the file is not present, then the script exits, as no more processing should be carried out.
如果文件不存在，那么脚本将退出，并且不应执行任何处理。
One useful application of this ability involves using the validator to automatically set default values for certain fields if they're not present in the POST submission.
这个功能的一个有用的应用是：如果某些字段没有出现在POST提交中，可以使用验证器自动设置这些字段的默认值。
If the baseline file is not present at reporting time, the classes that were not loaded will be absent from the report.
如果基线文件没有在报告时出现，那么没有载入的类将不会出现在报告中。
Birthdays, Valentine's, and Anniversaries are not quests to see if we can find the perfect present, again!
我再说一遍，生日、情人节、纪念日，这些日子都不是用来试探我们能不能买到完美的礼物的！
For example, during a period of heightened stress, participants may be willing to provide liquidity to a market if a strong central counterparty is present but not otherwise.
例如，在高度紧张时期，如果出现一个重要的强有力的交易方，参与者可能愿意向市场提供流通性。
If the user's home directory is not present, it exits and does not allow the user to log in.
如果用户的主目录不存在，它就退出，不允许用户登录。
It first looks to see if the user's entry is present in the remote server or not.
它首先查看用户条目在远程服务器上是否存在。
The feature pack installation image also contains two required fixpacks and will prompt you to install them if they are not present.
FeaturePack安装镜像还包含两个必需的修补程序包，如果它们不存在，将会提示您安装。
The configuration logic for Eclipse does not allow a new feature to be added if it has included optional features that are not present.
当新的功能部件包含有可选功能部件，但那些可选功能部件并不存在时，Eclipse的配置逻辑不允许添加这个新的功能部件。
The added code checks to see if the parameters.xml.done file is not present because if this file is already present, that means that the RDS installation is already done and should not be done again.
增加的代码用于检查 parameters.xml.done文件是否存在，因为如果这个文件已经存在，意味着RDS安装已经完成，不应该再次安装。
If the data or instruction is not present in the cache, or if the cache line is invalidated, the CPU updates its cache by reading the data from the main memory.
如果数据或指令没有出现在高速缓存中，或者如果高速缓存线路无效的时候，CPU通过从主存储器中读数据来更新它的高速缓存。
You also have the option to create tables on target nodes using master replicates if those tables are not already present.
如果那些表不存在，那么可以通过另一个选项使用主复制在目标节点上创建这些表。
If this configuration file is not present, the next searched for is C0A8000, and so on.
如果这个配置文件不存在，第二个搜索就查找C0A8000，依次类推。
Always speak positively about past and present employers even if your experience has not been positive with them.
谈到过去和现在的雇主，永远要保持积极的口吻，哪怕你和他们处得并不好。
What's more, when a vibration test was performed in this condition, no loosening occurred, indicating that a self-locking effect is present even if the nut is not fully tightened.
更重要的是，在这种情况下进行振动测试，螺母没有出现松脱现象。这表明即使螺母没有完全扭紧，其自锁效果仍然存在。
Passivity: this will not declare the queue but will cause an exception if no such queue is present.
惰性：如果没有声明队列，那么在执行到使用的时候会导致异常，并不会主动声明。
Passivity: this will not declare the exchange but will cause an exception if no such exchange is present.
惰性：如果没有声明交换器，那么在执行到使用的时候会导致异常，并不会主动声明。
If an activity session is not present, the component will execute in the context of the existing unit of work scope or a local transaction.
如果不存在活动会话，则组件会在现有的工作范围单元或本地事务的上下文中执行。
If a global transaction is not present, the component will execute in the context of a local transaction.
如果不存在全局事务，则组件将在本地事务的上下文中执行。
IIS will not serve up a file that is not present, so your handler will never fire if the update path is invalid.
IIS不能处理未在列表中的文件，所以如果更新路径无效的话你的处理器将永远不会触发。
When you go to publish or save a draft to your site, WLW will check that all these are present and, if not, ask you to add them.
当你保存完草稿准备发布文章时WLW会帮你检查你是否已经添加了这些，如果没有的话那么就赶紧吧。
If the XML input parameter file is not present, the script will prompt for input from the console.
如果XML输入参数文件不存在，则脚本将提示从控制台进行输入。
Find the argument, and generate a fault response if it's not present or has the wrong type.
找到参数，如果参数不存在或参数类型错误，则生成错误响应。
If a global transaction is not present, a new transaction scope will be established.
如果不存在全局事务，则会建立新的事务范围。
If it is not found, then the nearest matching combination present on the system is used.
如果未找到，则使用系统上存在的最接近的匹配组合。
They think if you are not satisfied with your present job, of course you have the right to replace it with a more challenging and better paid one.
他们认为如果你对现有的工作不满意，你当然有权利换一项更富有挑战性而且收入更好的工作。
This attribute indicates that a transaction is needed and will be started by the method if one is not already present.
此属性表示需要一个事务，并且如果事务不存在，则由方法启动。
If you decide to to disable the Unused Imports warning, those markers will not be present.
如果您决定不去管未使用导入的警告，那么标记也不会显示。
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