他新项目进展不顺，处境艰难。

He's having a ___rough time with his new project.

即使是经验丰富的徒步者，在那条小径上也可能经历艰难时刻。

Even experienced hikers can have a ___rough time on that trail.

谈判过程艰难，对所有参与者来说都不愉快。

The negotiations were ___rough and unpleasant for everyone involved.