The US mission in Afghanistan will "likely result in failure" unless troops are increased within a year, the top general there has said in a report.

美国驻阿富汗最高上将在报道中称，在阿富汗的行动“看样子要以失败告终”，除非军队数量能在一年以内增加。

The general's report carries a direct call for extra troops

Gen Stanley McChrystal made his assessment¹（评估，估价） in a copy of a confidential² report obtained by the Washington Post.

He recently called for a revised military strategy in Afghanistan, suggesting the current one is failing.

More than 30,000 extra US troops have been sent to Afghanistan since May - almost doubling the US contingent³（分遣队）.

The number of US troops in Afghanistan is already set to rise to 68,000 by the end of the year.

Stark⁴ concerns have previously⁵ been expressed about the viability⁶（生存能力） of the military mission in Afghanistan, but the BBC's Paul Reynolds says what is new about the general's warning is his outright⁷ use of the word "failure".

Gen McChrystal, who took over as military commander in May, is expected to make a separate request for tens of thousands of extra forces to be deployed（展开，部署）.

He also says that training for Afghan forces needs to be speeded up - and that the growth of Afghan forces should also be accelerated.

A senior adviser⁸ to Afghan President Hamid Karzai said the government was not against more international troops being sent, though their success would depend on where they were sent.

But he agreed that domestic forces were crucial to the operation.

"Our official stance is that until our security forces are strengthened, both in terms of numbers and quality, there won't be a long-lasting peace in Afghanistan," Sebghatullah Sanjar told the BBC.

US President Barack Obama has recently said the right strategy for Afghanistan will have to be found before any fresh commitment of forces can be considered.