During the dry season the land is rock hard.

土地在旱季硬如岩石。

《柯林斯英汉双解大词典》

Freddie Mercury was a flamboyant star of the hard rock scene.

弗雷迪·默丘里曾是硬摇滚乐舞台上一颗耀眼的明星。

《柯林斯英汉双解大词典》

For example, many sensation-seekers enjoy hard rock music.

例如，许多寻求刺激的人喜欢硬摇滚音乐。

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The muscular man is working hard to control a powerful drill that is cutting through the rock that surrounds him.

VOA: special.2009.03.23

They seem like the hard rock maple trees often found in that area, nothing can make them move.

VOA: special.2009.03.07

It mixes the sounds of hard punk and heavy metal rock and roll.

VOA: special.2009.11.06

The shekel, under an exchange-rate policy introduced in 1991, is rock hard so hard, in fact, that it is giving the government fits.

ECONOMIST: Israel

But they are not paragons of virtue, and even if they were, young people who follow them and organize their own naive ambitions around theirs will eventually run into the rock hard reality that drugs are to sport what Twitter is to celebrities -- not exactly essential, but a valuable resource when used strategically.

CNN: Opinion: It's time to allow doping in sport

Meeting women's representatives at the Gorki presidential residence near Moscow, Mr Medvedev said that as a schoolboy he had mainly listened to "rock music and hard rock".

BBC: Russia election: Medvedev and Putin reveal music tastes