She was a hard taskmaster.

她是个严厉的工头。

《牛津词典》

Teeth have a hard surface layer called enamel.

牙齿有一层叫做釉质的坚硬表层。

《牛津词典》

There was a hard frost that night.

那天晚上寒冷多霜。

《牛津词典》

Then,a hard cast may be put around the area of the break to hold the bone in place while it heals.

VOA: special.2009.02.04

You've had a hard life. That hard life, you think, is really what made you into the writer you are.

你的生活很艰难，你觉得正是那种艰难让你成为了作家。

耶鲁公开课 - 1945年后的美国小说课程节选

And kids were having a hard time in school just because of the language barrier.

在校的儿童们遇到的困难主要来自于语言沟通障碍。

帮助多文化的家庭 - SpeakingMax英语口语达人

But in the meantime the spirit of new beginnings is a hard one to temper.

BBC: Tunisia��s vanguard hotels

Mr Obama prevailed despite lingering dissatisfaction with the economy and a hard-fought challenge by Mr Romney.

BBC: President Barack Obama defeats Romney to win re-election

It's a hard game to explain, and even harder when it's tangled up with politics.

NPR: The Volatile Mix of Politics and Golf