We slept on the hard ground, ate canned beans from cold metal plates and spent our days in the difficult search for gold.

VOA: special.2009.07.04

But,it's hard,if you're fourty-seven years, your job is a pretender to the throne, it's difficult.He had a hard time getting around.

但是,如果你要花四十七年,去争夺王位,是很不容易的,他做得很艰苦

耶鲁公开课 - 1871年后的法国课程节选

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

These are rugged mountains in the Sinai close to the coastline, mountains with difficult, hard to find paths.

NPR: Suicide Bombers Hit International Force in Sinai

Wainwright was difficult and hard to work with.

BBC: Booktalk: The political books of 2011

Turner says it's very difficult to provide hard-and-fast earnings estimates for Northern Peru in these early days.

FORBES: Latin Mining Via Toronto