Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.

给它安装无线电设备是很困难的，而且仅凭肉眼观测也太不可靠，无法对它的行为进行确切的观察。

youdao

These methods may be useful for a while, but it is difficult to solve this problem completely.

这些方法可能暂时有用，但要完全解决这个问题是很困难的。

youdao

With so many variables, it is difficult to calculate the cost.

有这么多的可变因素，很难计算出成本。

《牛津词典》

Today,the solution to the problem is so common that it is difficult to understand that there was a problem at all.

VOA: special.2010.07.14

And so part of the wilderness experience for me I think Mark Twain talks about wilderness and he says, I do it chiefly because it is difficult.

对于我来说，荒野的经验就像是,马克吐温在谈到荒野时所说，因为困难，所以我才去做。

普林斯顿公开课 - 人性课程节选

He says that it is difficult to make the distinction.

他说很难区分。

耶鲁公开课 - 文学理论导论课程节选

Stand somewhere for a few minutes and it is difficult to avoid seeing something move.

BBC: Colombia��s prison turned paradise

From a corporate governance standpoint, it is difficult to argue against more transparency, however.

FORBES: SEC's Political Disclosure Proposal Will Improve Corporate Governance

It is difficult to fathom that Apple executives have their heads buried in the sand.

FORBES: Double Whammy For Apple