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

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

It will be challenging for the company as it transitions from soft-rock mining to hard-rock mining.

FORBES: High Costs In 2013 Will Continue To Be A Hurdle For IAMGOLD