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。

youdao

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。

youdao

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。

youdao

It is impossible to imagine many of George's songs without Ira's perfectly chosen,often surprising words.

VOA: special.2009.02.08

But the prime minister also admits that in a country where HIV and AIDS victims are often abandoned by their families, fear of the disease could make it almost impossible to stop its spread.

VOA: standard.2009.04.04

Indeed, so vicious that it is often impossible to simply punish the cheater him or herself.

FORBES: The Sins of the Father: Dishonor, Disgrace and Boiling Cheaters in Oil

But it is often impossible to obtain enough admissible evidence to obtain a conviction, the government argues.

ECONOMIST: Liberty v security

Expanding distribution capacity is often impossible in crowded urban areas, and elsewhere people dislike new power lines.

ECONOMIST: Charge ahead