The optimizer normally chooses a table scan if no appropriate index has been created or if an index scan would be more costly.
如果没有创建合适的索引，或者如果索引扫描的成本更高一些，优化器通常就选择表扫描。
Diagnosis may later involve an MRI scan if a tear in the hip cartilage is suspected, but this can be difficult to ascertain.
随后的诊断包括核磁共振，如果怀疑髋关节软骨撕裂，但是很难确诊。
Cap last scan: Indicates whether to cap the last scan if you are not using arbitrary polygonization. For Scoll, see Boolean Data Type.
扫描下限：如果你没有使用任意多边化指出是否定义扫描下限。
The MSP430FW427 is used as control MCU. The function is realized by the SCAN IF module without IC circuit external, which improves the precision and sensitivity of flow measurement.
主控器采用目前国际上功耗最低的MSP430FW 427单片机，该单片机能够利用内部流量扫描模块（SCAN IF）有效地转换振荡波形，不需要外部流量检测IC，提高测量的精度和灵敏度。
If you look at the PET scan, I look just like one of those killers.
如果你看我的PET扫描，我的看起来就像那些冷血杀手。
If I can scan my consciousness into a computer, am I still me?
如果将自己的意识扫描到电脑中，那我还是我吗？
If these techniques fail, researchers could perform an MRI scan on the container, but this option is expensive and would involve transporting the half-ton coffin to a hospital.
如果这些技术都失败了，研究人员可以设法对棺材使用核磁共振扫描，但此项选择需要昂贵的经费，并会涉及到怎样把半吨重的棺木运送到医院。
If DB2 used a single index range scan from 20 to 30, it would miss this document and return an incomplete query result.
如果DB 2在20到30之间使用单个索引范围扫描，则会错过该文档，并返回不完全的查询结果。
If the parser finds anything other than these three tokens during its scan, the expression it's scanning is considered invalid.
如果解析器在其扫描期间发现了除这三个记号外的任何其它记号，则认为它正在扫描的表达式是无效的。
On a subsequent scan, if a newly computed checksum is different from the previously generated checksum, the page is changing and is therefore not a good candidate for merging.
在一次后续扫描中，如果新计算的校验和不等于此前计算的校验和，则该页面正在更改，因此不是一个合格的合并候选对象。
If a table scan is used, the clustering would not really be beneficial because DB2 still has to read all rows and then the physical ordering is not very important.
如果使用表扫描，那么聚集就不会真正有益，因为DB 2仍然必须读取所有的行，那么物理排序不很重要了。
If the plan includes a scan of the extended index you will see the EISCAN (highlighted in Figure 3).
如果计划包括对扩展索引的一个扫描，您将发现EISCAN(在图3中高亮显示)。
"The scan script sends the public password for the product, and if the device responds with the 'command prompt' for that product interface, then the machine is obviously open," Stolfo said.
斯多夫说：“扫描程序脚本向这些网络设备发送对应厂商的公共密码，如果设备对“命令提示”做出与之对应的响应，那么很明显这台设备是不设防的。”
The service that hosts the dataset could scan the web for these inbound links and, if desired, reflect them back to its users.
存放数据集的服务能够针对这些入站链接扫描网络，如果需要的话，就返回给用户。
If you download programs from the Internet be sure to scan them with an up to date virus scan.
如果你从网上下载程序，一定要用更新的防毒软件扫描它们。
Open them for 5 minutes, do a quick scan, post an update or reply if necessary, then get out.
打开他们，只花5分钟，快速的浏览下，如果有必要就更新下状态或者回复下，然后退出。
But if each peasant has to scan her irises every time she picks up her ration, it will be harder to scam the system.
但若每个农民每次领取补贴配给量时，都须扫描虹膜，那么该补贴制度就很难诓骗。
Dynamic analysis tools today make it easy to add a missed section to a scan, but it is often hard to determine if parts were indeed missed (and if so, which ones).
当今的动态分析工具很容易就可以将遗漏的部分添加到扫描中，但是通常很难确定这些部分是否确实被遗漏了(如果确实遗漏，是哪些)。
Whether or not a scan is needed, the system usually pays if a doctor orders it-and the scan might help defend the doctor against a malpractice claim.
不管是否需要，如果医生订购扫描仪，医院就会付账- - - - -这台扫描仪或许可以帮助医生反对索赔。
The scan might take 592 CPU instructions or more if the cookbook is not already in database memory, and it might take five seconds to complete.
扫描可能执行592条CPU指令，如果烹调书还没有放在数据库内存中，指令可能更多；扫描可能会花费5秒才能完成。
This is a noninvasive heart scan that takes about 10 minutes and can tell you if you have any developing plaque in the vessels that supply blood to your heart.
此项非侵入式心脏扫描需时约10分钟，随后可提供血液报告，告知心血管中是否有斑块存在。
If it is too much trouble to scan in a new piece of paper, you won't do it.
如果放在一张新的纸上去浏览比较麻烦，那你就不要这么做了。
If possible, schedule the scanner's update process to run before the scan program itself.
尽可能先更新扫描软件再运行该软件。
Too many columns in a table can make the scan time for queries much longer than if there are just a few columns.
一个表中有太多列比仅有一些列时进行查询所需的扫描时间要长。
If you want to scan the raw data information that goes past on the network, you need to use a tool other than nmap, which only scans, hosts, and ports.
如果您希望扫描经过网络传输的原始数据信息，那么您需要使用一种其他工具，而不是nmap，因为它只能扫描主机和端口。
If they are, then ArcExplorer will access and scan those tables upon startup or when a new layer is to be added.
如果注册了那些空间列，那么ArcExplorer将在启动时或者要添加一个新层时访问和扫描那些表。
Then: If you have antivirus software, such as Norton's or MacAfee's, run a scan immediately.
然后：如果你有像诺顿和MacAfee这样的杀毒软件，那就立即来个全面的扫描病毒吧。
If you also want to scan the User Datagram Protocol (UDP) ports, you must specify the -su options, as shown here in Listing 3.
如果您还希望扫描用户数据报协议(udp)端口，那么您必须指定- su选项，如清单3中所示。
For example, if a child's connectivity scan shows a brain age of 8 but his or her chronological age is 15, "you'd probably start to worry that maybe something isn't going right," he says.
例如，如果一个小孩的脑部连通性扫描结果显示其大脑年龄为8岁，而他(她)的实际年龄是15，“我们就要开始怀疑也许他(她)的脑部出现了问题。”
For example, if a child's connectivity scan shows a brain age of 8 but his or her chronological age is 15, "you'd probably start to worry that maybe something isn't going right," he says.
例如，如果一个小孩的脑部连通性扫描结果显示其大脑年龄为8岁，而他(她)的实际年龄是15，“我们就要开始怀疑也许他(她)的脑部出现了问题。”
应用推荐