Reducing demand has been difficult.
事实证明，降低需求非常困难。
It has been difficult to gauge the human impact of the accident.
这次事故对人类的影响难以估量。
But it has been difficult to pin down the exact relationships between them.
但要准确定义它们之间的关系还是有困难。
But they insist that is not the case and the decision has been difficult.
但是她们坚称，不是这么一回事，这是个艰难的选择。
Even within New York City, travel has been difficult.
即使在纽约市里，出门也很困难。
An answer to the first of these has been difficult to obtain.
关于第一问题的答案是很难获得的。
That requires industry-wide cooperation, which has been difficult to achieve.
这要求整个行业进行协作，但通常很难办到。
And until recently, it has been difficult to model that complexity in the laboratory.
直到最近，这种复杂的关系还难以在实验室中模拟出来。
The simple via connection has been difficult to achieve high-quality signal transmission.
因此简单的过孔连接已经难以实现高质量的信号传输。
The simple via connection has been difficult to achieve high-quality signal transmission.
因此简单的过孔连接已经难以实现高质量的信号传输。
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