除其他弱点外，城市在独自应对空气污染时而必须采取的措施存在政治上的争议，因此也很易受到攻击。
Among other weaknesses, the measures cities must employ when left to tackle dirty air on their own are politically contentious, and therefore vulnerable.
问题是，人们通常不能直接观察竞争，而必须从一个物种的扩展或增加和同时另一个物种的减少或消失来推断。
The problem is that competition ordinarily cannot be observed directly but must be inferred from the spread or increase of one species and the concurrent reduction or disappearance of another species.
他们只是在做为防止植被遭大规模破坏而必须做的事情。
They are only doing what is necessary to prevent wholesale destruction of vegetation.
长期专注于硬件的公司现在反而必须考虑生态系统，为消费者提供日常问题的实用解决方案。
Companies that have long focused on hardware now have to think of ecosystems instead to give consumers practical solutions to their everyday problems.
它是否很重要而必须回过头再来处理？
但我想这是为全球健康的利益而必须作出的牺牲。
But it is the kind of sacrifice I think you have to make in the interests of global health.
注意你为了达到目标而必须付出的时间。
Be aware of the time commitment that will be necessary to achieve your goal.
一周有三次，我为了参加体育课而必须走路到体育馆。
Three times a week I have to walk all the way to the gym for my Phys Ed class.
你可以想象你想保持呼吸而必须付出的努力！
Imagine the effort involved if you had to ensure that you keep breathing!
你永远不能让它控制你，而必须反过来控制它。
史密斯先生泄露了一项机密，因而必须接受惩罚。
这项工作不能由捐赠方驱动，而必须完全由国内机构驱动。
为得到精确的、可操作的结果而必须或能够处理的海量数据
The vast amount of data that you must process, or you can process, to produce accurate and actionable results
愿景是设想一个公司在实现前而必须具有的自己的目标和使命。
A vision is the image that a business must have of its aims and goals before it sets out to reach them.
但不能简单地说我们是为了培养后代而必须亲密起来。
But this is not a simple case of needing to bond in order to raise offspring.
用户描述描述了团队要实现产品需求而必须完成的工作。
User stories represent the work the team must accomplish to meet the requirements of the product.
后来他面临一些无法穿越的障碍，并因死期未到而必须回到地球。
Later, he sees himself approaching some impassable barrier, and he discovers that he must return to earth, that the time for his death has not yet come.
多个用户所输入的数据量会很快超过您为验证而必须传输的数据量。
The amount of data entered by various users will quickly exceed the amount of data you actually must transmit for validation.
有时候你必须遭受为了改变某件事而必须结束自己的决定。
Sometimes you have to suffer in order to end up taking the decision to change things.
因而，它们不能被直接访问，而必须通过DMA 移进来。
Therefore, they cannot be accessed directly, but must be moved in through DMA.
这就是反对者为了证明气候变化是一个骗局而必须揭示的阴谋。
This is the kind of conspiracy the deniers need to reveal to show that man-made climate change is a con.
简言之，这些都是任何一个国家为了保证国民幸福而必须提供的物质因素。
In short, these are the material factors that any State must provide to its people in order to ensure their happiness.
如果有些事情是你不想做而必须要做的，为什么不考虑将它们外包？
If you don't want to do things, but they need to be done anyway, why not outsource them?
这种设计并不可取，因而必须加以改进以确保控制好档案表的大小。
This design is not desirable, and must be refined to ensure that the size of the archive table is kept under control.
它还可以将编程人员不这样做而必须承担的应用程序性能调整工作量减到最少。
It also minimizes the amount of application performance tuning work that a programmer might otherwise have to undertake.
生产部门为每一个任务——为了生产所需产品而必须执行的——发布工作指令。
The production department issues work orders for each of the tasks that must be executed to produce the required items.
如果美国为鼓励企业家而必须更加努力工作，那么其他国家更要如此。
If America needs to work harder to encourage entrepreneurs, the rest of the world has to make even more of an effort.
但是为宣传或者住入而必须选择的新的或者变更的特性，是十分关键的。
But this is the critical moment during which new or changed features must be chosen for propagation or rejection.
但是为宣传或者住入而必须选择的新的或者变更的特性，是十分关键的。
But this is the critical moment during which new or changed features must be chosen for propagation or rejection.
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