The awkward design of the keyboard made operation difficult.

蹩脚的键盘设计造成了操作上的困难。

youdao

"They said,without this service, NGOs [non-governmental organizations and agencies will be unable to reach operation areas in the east and south of the country, and it is an area that is particularly insecure and difficult,"

VOA: standard.2009.08.02

In the book business, there's something difficult about maintaining an independent operation.

在书店行业里,要想保持独立的经营模式,还是有些困难的

耶鲁公开课 - 金融市场课程节选

The Kamajor militia, which has done most of the recent fighting against the rebels, and includes many child recruits in its ranks, is finding co-operation difficult.

ECONOMIST: Waking from Sierra Leone’s long nightmare | The

He said the rescue operation was "difficult because huge amounts of rocks have to be removed".

BBC: Poland miners: 19 rescued after earthquake

Judging by the past, close co-operation may prove difficult.

ECONOMIST: The City