Mary complains that it has been difficult to find experienced candidates.

玛丽抱怨很难找到有经验的候选人。

youdao

Reducing demand has been difficult.

事实证明，降低需求非常困难。

youdao

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。

youdao

Tell all the Truth but tell it slant -- The truth about Emily Dickinson has been difficult to discover.

VOA: special.2010.07.18

Why has it been so hard and why does it continue to be difficult to identify these pluripotent cells within tissues?

为什么会那么难呢,为什么在组织中识别多能干细胞,始终困难重重呢

耶鲁公开课 - 生物医学工程探索课程节选

I want to illustrate one of the reasons why it has been so difficult to get a grasp on the hair cells in the inner ear.

我想用图例为大家说明一下,为什么难以捕获内耳中的毛细胞。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

But connecting the dots between the ads and those activities has been difficult.

FORBES: What's A Mobile Ad Worth? Google Would Love To Show You

For non-premium content, it has been difficult to achieve sustainable profitability under these circumstances.

FORBES: Content Wars: The Struggle For Profit Amidst New Consumption Models

The exact relationship between PEDs and interference has been difficult to pinpoint, A4A acknowledged.

FORBES: Airlines Wary of Portable Electronic Devices on Planes