By contrast, an index that is not selective is not as useful.
与之相比，选择性低的索引就不那么有用了。
Bubble Chambers are not selective because they cannot be triggered.
气泡室由于不能触发而没有选择性。
If the table in your query are pretty small (usually fewer than 1,000 rows) or clustered tables, and your query is not selective at all, it would be beneficial to use a table scan.
如果查询中的表极其小(通常少于1,000行)或者是群集表，而且查询根本没有选择性的话，那么使用表扫描会更好一些。
Not all colleges offer merit aid; generally, the more selective a school is, the less likely it is to do so.
不是所有的大学都会提供奖学金；一般来说，越挑剔的学校越不可能这样做。
The problem is not that the facts are selective - all facts are selected somehow and for some purpose.
问题不在于那些是有选择性的事实——所有事实出于某种目的和方法都是可选择的。
The aim now is to ensure that the selective default period is as short as possible – days, if not hours – to minimise disruption.
现在的目标是保证选择性违约期限尽可能的短，几天，如果不是几个小时，将破坏变得最小化。
That is, I preferred to be so overloaded with facts and information that I had to be extremely selective, not to hide things but to write only what really mattered.
是这样，我更喜欢充斥着事实和信息，这样会变得极具选择性，并不是隐藏事实而是真正的去撰写那些有关的信息。
Since antibiotics are not very selective as to which bacteria they attack, those prescribed for a toothache can quickly wipe out a whole population of intestinal microbes.
因为抗生素对它要对抗的细菌没有很大的选择性，为治牙疼而开出抗生素可能会很快杀死一大批大肠中的细菌。
Thousands of years of selective breeding have produced extensive genetic changes in the plants and animals we eat, not all of them good.
数千年的选择性培育已经造成了食用植物和动物广泛的基因改变，并非所有的改变都是好的。
The gap between western enthusiasm for free trade in principle and its selective application in practice has not gone unnoticed in emerging markets.
西方国家在理论上大力支持自由贸易,而在实际操作中却选择性的应用这一政策，这之间的差距并没有被新兴的市场所忽视。
As if not wanting to admit to myself that I wasn't made out to be a "dater," I told myself that this slow period was about becoming more "selective."
仿佛不愿承认自己成为了一个“约会者”，我告诉自己放慢脚步是为了获得更多的选择性。
A selective Do not disturb feature has also been added, allowing you to select certain users or groups that can send you an IM even when the status is set to Do not disturb.
还添加了选择性的Donotdisturb特性，该特性允许您选择一些用户或组，以便在您设置为Do not disturb时仍可以向您发送IM。
And be selective when sending out “shouts” or “DMs” or whatever you send — send updates to people for whom they are meaningful , not everyone you just happen to have some connection with.
在发送“呼叫”或“数据库营销”或随便什么东西时要精心挑选-把内容更新发给对他有意义的人，而不是发给所有碰巧和你有点联系的人。
You should also be selective in your query so that the database does not return more rows and columns than you need.
您还应该使查询具有可选择性，这样数据库就不会返回您不需要的行和列。
She also subscribed to a selective amnesia: “I have the habit of forgetting what I do not care to remember, ” she conceded.
另外，她有选择性的健忘症：“我有个习惯，我会忘记那些我不想记住的事物，”她承认说。
"But it is not always a recipe for success to simply copy someone," said Kendal. "Animals are often better off being selective about when and who they copy."
“但是仅仅模仿同伴并非就是成功的秘诀，”肯德尔说，“能够在时间上及学习对象上具有选择性的动物往往更胜一筹。”
For example, what if the two local predicates are not as selective as estimated by the optimizer?
例如，如果这两个本地谓词选择性没有优化器评估的强，怎么办？
It argues that although it is a living organism, which would normally be outside the scope of patent law, it is also a true artefact, not just the product of selective breeding.
争论认为尽管它是一种生物体，不在普通的专利法范围内，但它又确实是一种人工制品，而不是简单的产品筛选。
This functioned as a selective bridge, permitting the passage of positively charged sodium ions, but not negatively charged chloride ions.
它可以作为有选择的桥梁让带正电的钠离子通过，同时阻止了带负电的氯离子。
To begin with, the memory of previous aid triumphs is highly selective: the initial response to Haiti was chaotic and not all that promised cash arrived.
首先，先前援助的辉煌记忆是经过精挑细选的：起初对海地地震的回应乱成一团，有些承诺的现金也还没到位。
At least I'm not being too much of a burden. I could eat meat but be a "selective omnivore" — someone who eats meat only from family farms — but that's a much heavier blow to table fellowship.
至少我不是个多大的负担，我可以吃肉，但是个“有选择性的偏食者”——只吃家庭养殖的肉——但这对饭桌交际是个更大的打击。
Aside from being selective about the equipment you bring—so you're not lugging a ton of stuff around the entire trip—she recommends you be fairly selective about the photos you take.
除了选择好你带的器材之外（这样你就不用在整个旅程中都拖着沉重的器材），丽莎劝告你相对有选择性的取点照相。
If not, then be selective about what tests you run based on what you want the testing to accomplish.
如果不是，那么请选择你想要完成测试的部分进行测试。
Selective emigration would imply the opposite, since people would presumably desert places where their attitudes were not the norm in favour of countries where their preferences were more typical.
精心选择移民地的移民可能暗示着相反的结论，因为人们大概会抛弃和他们观念不同的城市而更喜欢那些他们更能融入其中的城市。
It is not clear whether these were firm offers or merely the airing of possibilities; nor, since the leaks were presumably selective, whether Israel demonstrated any matching flexibility.
现在既不能确定谈判中的让步是确实的报价还是对可能性的陈述，而且由于文件的披露是选择性的，也不能确认以色列人是否也展现了对应的灵活性。
'Maybe in the past, women didn't feel they had the right to be selective,' she says, 'but I want to find a partner, not just a man.'
她说，或许过去女性觉得自己没有选择的权利，但我想找个伴侣，而不仅仅是个男人。
The authors said: 'Numerous popular books advise people not to display their affections too openly to a potential romantic partner and to instead appear choosy and selective.'
几位作者说：“很多畅销书都建议人们不要对一个潜在的恋爱对象过于明显地表露他们的情感，相反，这些书建议人们应该表现得更挑剔一些。”
Not a tool you need every day, but really useful when you want it, DownThemAll is a selective, powerful download manager.
它并不是我们每天都要用到的工具，但是在我们需要的时候却能发挥很大的作用，DownThe mAll是一个精挑细选的强大的下载管理器。
Not a tool you need every day, but really useful when you want it, DownThemAll is a selective, powerful download manager.
它并不是我们每天都要用到的工具，但是在我们需要的时候却能发挥很大的作用，DownThe mAll是一个精挑细选的强大的下载管理器。
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