Although there is 34,500 tons of gaseous nitrogen in the air column above each acre of the earth's surface, this cannot be used by plants until it has been fixed by nitrogen-fixing bacteria and algae.
虽然在地球表面每英亩空气柱中有34,500吨气态氮，但是如果这些气态氮不被固氮菌和藻类固定，是不能被植物利用的。
That beams of light cannot be held stationary, and thus used as a form of memory store, is a big obstacle to doing this.
光束无法被固定在一点上被捕捉，这样只可以被用作为一种存储形式，而这也是很大的一个障碍。
Note, however, that the generator cannot decide on whether a pattern should be used: this is a tradeoff the (generator) developer has to make manually.
然而需要注意，生成器并不能决定是否应用某个模式：这需要(生成器的)开发人员人工地作出权衡。
Using their certificates, they can take means of consumption which used up the same amount of labor; this is not money because it cannot be accumulated.
用这份证书，他们可以领取与他所耗费劳动量相当的消费资料；但这证书并不是货币，因为它不能用以积累。
Create a new user id in your external security facility and mark this user id as invalid so that it cannot be used.
在外部安全设施中创建一个新的用户ID，并使这个用户ID无效，使之不能被使用。
This also points out a limitation of the QBE approach -- zero cannot effectively be used as a value to search on.
（这同样指出了QBE方法的一个缺点 ——不能够有效地使用0作为搜索值）。
However, as of this writing, the Accelerator Packs cannot be used with DataPower.
然而在撰写本文之际，加速器包还不能与DataPower一起使用。
As it's your own major though it cannot be used frequently in this small city for the narrow employment opportunities, but it can be my superiority.
作为自己的专业，在这样的小城市中虽然因为就业面太窄可能无法频繁的应用，但却可以成为我的优势。
This broker is used for test purposes and its availability cannot be guaranteed, so have patience.
该代理是测试用的，其可用性得不到保证，所以用户需要耐心些。
A good example of this problem is the LKCD kernel crash utility, which cannot be used in local dump configuration with RAID devices.
这个问题的一个很好的例子是LKCD内核崩溃工具，不能用于配置RAID设备的本地转储。
A new security patch from Microsoft, released this week, plugs the last of the four security holes that Stuxnet USES to spread itself, but it cannot be used on older systems, widely used in Iran.
本周由微软公司发布的一个新安全补丁堵住了被震网病毒用于自我传播的四个安全漏洞中的最后一个，不过，这一补丁却无法用于版本较老的系统中，而这类系统在伊朗被广泛使用。
This in turn means it cannot be used as a definite assignment to a variable.
反过又意味着，分部方法不能作为一个明确分配的变量。
When migrating from a V4 multi-node configuration, the migration wizard cannot be used to migrate the deployment manager, this step must be completed manually.
当从v4多节点配置迁移时，不能用迁移向导来迁移部署管理器，这一步必须手动完成。
This utility can only be used on Root component attributes, and cannot be used on other components such as child components.
本实用程序仅可用于根组件属性，不可用于其他组件，如子组件。
This pattern CANNOT be used in cases of method overloading.
这个模式不能用于方法重载。
This effectively means that an ALTER operation cannot be used to drop a column on a table that contains an XML column.
这实际上意味着，在包含xml列的表中，不能用ALTER操作删除列。
FIXED format cannot be used because this format mandates the presence of EXTERNAL column specification, which is not possible with this type (EXTERNAL column specification is discussed below).
不能使用fixed格式，因为这种格式强制要求external列指定(external列指定将在下面讨论)，而这对这种格式是不可能的。
This container cannot be used if the emergency parachute is mounted in a frontal position.
如果紧急伞（副伞）被放在前面，这个装置是不能被使用的。
This modifier cannot be used with the CURSOR file type.
1该修饰符不能用于CURSOR文件类型。
This results in a difficult situation: fairly commonly used features, such as including other files in a makefile by reference, cannot be done portably!
这就导致出现了一种复杂的情况：很常用的一些特性，例如在makefile 中通过引用来包含其他文件，都不能很好地移植！
This command cannot be used to change the type of connection factory. For example, to remove the send and receive channel exit configuration from the connection factory created above.
无法使用此命令更改连接工厂的类型。
The Banks are not getting this help, which will be available only for assets existing at the end of 2007 and cannot be used to finance new lending, for nothing.
并不是所有的银行都能得到这种帮助。
This battery cannot be used in combination with other types of primary or secondary batteries, or the abnormal charge or discharge will make batteries overheat, smoke, deform or burn.
电池不可与其他类型的一次或二次电池混用，否则会因为不正常充、放电造成电池发热、冒烟、变形或燃烧。
This bill will establish a simple, uniform standard which cannot be used, however ingenious the effort, to flout our Constitution.
这个法案将会设立一个简单的，统一的准则，但无论如何不能是惯常的，狡猾的成就来侮辱我们的国会。
The specified transition type cannot be used on this transition.
指定的转换类型不能用于此转换。
This is where it cannot be used as a commodity.
这是它不能被用来作为一种商品。
However, this approach cannot be used for analysis of load characteristics because it proves impossible to specify periodic boundary conditions.
上面的方法不能用于负载特性分析，原因在于不能确定周期性的边界条件。
However, this approach cannot be used for analysis of load characteristics because it proves impossible to specify periodic boundary conditions.
上面的方法不能用于负载特性分析，原因在于不能确定周期性的边界条件。
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