Trying to apply new methods to projects that have established deadlines is difficult, and often impossible.
在确定了最终期限的项目中运用新的方法是相当困难的，通常是不可能的。
It adds a significant cost to operating a business, and this cost is often impossible to quantify at the outset.
它明显地增加了开店的成本，但这些成本又无法在开始时确定。
At the same time, we ask humans to perform what are often impossible monitoring or backup tasks and then blame them when the inevitable accidents occur.
同时，我们还让人类去做那些通常是不可能的监控和备份的工作，然后在不可避免的事故发生的时候把责任归咎于他们。
For instance, it makes sense to cache map data to reduce response time, but it's often impossible or impractical to cache results of search queries or real-time traffic information.
比如，可以缓存地图数据来减少响应时间，但通常并不适合将搜索查询结果或者实时交通信息进行缓存。
Donor anonymity means it is often impossible to get medical details that would be useful for the child.
捐赠者匿名也就意味着不可能获得有利于小孩的医疗详细信息。
The demand for accommodation is so great that it is often impossible for ordinary people to buy a house of their own.
由于住房的需求非常大，普通人常常不可能买到真正属于自己的住房。
However, it is often impossible for ordinary manufacturers to provide the professional measurement conditions, such as an EMI receiver.
对于一般的生产厂商而言，难以具备EMI接收机等测试条件。
Especially, accurate restoral of sources waveform is often impossible when there are Gaussian noise or modulatory sources in sensor measurement.
特别是，当传感观测中存在高斯噪声或调制源时，往往无法获得准确的源波形恢复。
It is often impossible to determine if human-to-human transmission has occurred since the family members are exposed to the same animal and environmental sources as well as to one another.
这往往很难确定是否发生了人际传播，因为家庭成员都暴露于同样的动物和环境来源并且彼此接触。
It is often impossible to determine if human-to-human transmission has occurred since the family members are exposed to the same animal and environmental sources as well as to one another.
这往往很难确定是否发生了人际传播，因为家庭成员都暴露于同样的动物和环境来源并且彼此接触。
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