More elements can be added to a realized list when and only when, access is required.
只能在需要访问时在现有列表中添加更多元素。
Presumably the endpoint would then receive RSS item fragments when and only when that resource updated.
这样推断，端点当且仅当资源更新时才会收到RSS条目片断。
The abstract data buffer allocates the memory blocks when and only when the actual data becomes available.
抽象数据缓冲区仅在实际数据变得可用时才分配内存。
And this is what logistics is chiefly concerned with. Products are of any value when and only when they are moved to the right place where it is available to the customer.
而这也正是物流所关心的，产品只有在被运送到能被消费者买到的场所时才体现出价值。
When, and only when, these behaviors occur, does an authority relationship exist between the superior and subordinate.
当且仅当这些行为发生时，在上级和下级之间才存在一种权威关系。
In general, your attitudes will be internally consistent only when the behavior is easy, and when those around you hold similar beliefs.
一般来说，只有当行为简单而且周围的人和你有相似的信念时，你的态度才会表现得与内在一致。
Overwork and exhaustion are the opposite of resilience and the bad habits we acquire when we're young only magnify when we hit the workforce.
复原力与过度劳累和精力衰竭恰恰相反，进入职场后，我们年轻时养成的坏习惯只会不断放大。
Drugs are only approved after tests have demonstrated that they are relatively safe when used as directed and when their benefits outweigh their risks.
药物只有在试验证明它们是相对安全的情况，且其益处大于风险时，才会被批准使用。
When, and only when, these behaviors occur does an authority relationship exist between the superior and subordinate.
当且仅当这些行为发生时，在上级和下级之间才存在一种权威关系。
And they only appear when the database administrator runs a query profiler on your system when it has performance problems.
并且它们只有在数据库管理员在系统具有性能问题时在系统上运行查询剖析器时才会出现。
When (my husband) and I split up the only thing I came out of marriage with was what I had when I went in — my furniture, books, record albums.
“我丈夫和我的婚姻结束后，随我一起走出婚姻围城的只剩下我结婚时就有的家具，书和一些唱片了”。
When, and only when, these genes are turned on do the bacteria make these proteins and light up.
在且仅在这些基因被激活的情况下，细菌才会制造相应的蛋白，并将其点亮。
The roses will come every year, and they will only stop when your door's not answered, when the florist stops to knock.
玫瑰每年都会送来，而且，只有当你不再应门时，只有当花店店主停止敲门时，它们才不会再来。
As in other walks of life, people become wiser and take precautions only when they have learned what happens when they don't.
正如在其他各行各业，只有当人们了解了不采取预防措施可能带来的后果时，他们才变得聪明。
Fear can be a guiding friend if you learn how to swallow it, and listen to it only when it serves its true purpose of warning you when you are in danger.
恐惧的真正意义，是可以在你身处危险时给予你警告。如果你能够好好地控制它，并在需要的时候跟从它，那它将成为一位良师益友。
When using channels with DPL, only the changed and new containers are returned to the calling program when a DPL is complete.
将DPL与管道一起使用时，在 DPL完成后，只将已更改的和新的容器返回到调用程序。
Young people like it best when parents take a consulting or coaching role, listening — and offering advice only when asked, Dr. Madsen says.
麦德森说，年轻人最喜欢的方式是，父母只有在孩子要求的时候，才会扮演顾问或指导员的角色，倾听并提供建议。
This means you only have toupdate one install when new versions are released and, when it comes toediting source code or uploading plugins, you only have to do thosejobs once.
这意味着当新版本发布，当需要对源码进行编辑或者上载插件时，你只需要更新一个安装版本，也就是说你可以一次性做完这些工作。
During the ensuing conversation, it's advisable to tilt the phone away from your ear when you are talking and only bring it in close to your ear when you are listening.
在随后的交谈中，明智的做法是讲电话的时候把手机倾斜移开你的耳朵，只有当听电话的时候才靠近耳朵。
Using a real life analogy, when you travel by air, you check-in large pieces of luggage and only claim them when you reach a transfer point or your destination.
使用一个真实类比，当您乘飞机旅行时，要签入托运大件行李且只要在到达中转点或目的地时才领取它们。
Use an extends wildcard when you only get values out of a structure, use a super wildcard when you only put values into a structure, and don't use a wildcard when you do both.
仅从某个结构中获取值时使用extends通配符；仅将值放入某个结构时使用super通配符；同时执行以上两种操作时不要使用通配符。
I’ve learned … That it is best to give advice in only two circumstances; when it is requested and when it is a life threatening situation。
我明白了…发表建议最好在以下两个场合：别人发出请求，和生命收到威胁的时候。
You can configure updates to be automatically downloaded when they are available, and you will only be interrupted when Eclipse is ready to install them.
此外，也可以配置为查找到更新时自动下载更新。 这样，只有Eclipse准备安装更新时，才会通知您。
We must outstrip history and we can do so only when past, present, and future cease to be important, when where and when we live becomes a matter of indifference.
我们必须跨过历史，而唯有过去、现在、与未来不再重要之时，我们生活在何时、何地变得毫无差别之时，我们才能做到这一点。
The scientists hope that understanding brain scans during sleep will enable researchers to develop tools to keep us asleep when we want to sleep and to wake us up only when it is time.
科学家们希望，在睡眠中对脑部已知功能区域的扫描能够让研究者们开发出一些工具，让我们在想要睡觉的时候保持困倦状态，该起床的时候自然起床。
Application WPARs are only temporary objects; they are created when the process is started and destroyed when the last process within that application partition ends.
应用程序WPAR只是一些临时对象；在启动进程时创建它们，在应用程序分区中的最后一个进程结束时销毁它们。
Use grouped options when the number of options is relatively small, and when only one option may be chosen at any given time.
只有在相关的选项比较少，以及任何时间只有一个选项被选中的情况下使用分组选项。
Use grouped options when the number of options is relatively small, and when only one option may be chosen at any given time.
只有在相关的选项比较少，以及任何时间只有一个选项被选中的情况下使用分组选项。
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