σκληρό in inglese:

Study hard.

A pick is a long handled tool used for breaking up hard ground surfaces.

The hard rain spoiled our hike through the woods.

Mary has a bad back. It's hard for her to lift things.

I'm sure it wouldn't be too hard to find another place to live.

He's somewhat hard of hearing, so please speak louder.

It is hard for an old man to change his way of thinking.

His success is attributed more to hard work than to genius.

Whether you succeed or not depends on how hard you study.

A chance to do as we please, especially to do as little hard work as possible, is a secret desire of almost everybody.

Please don't boil the eggs so hard.

Many people in these parts have fallen on hard times.

Just staying alive in these times is hard enough.

My heart is pounding so hard it feels like it's going to explode.

The reason for your failure is that you did not try hard enough.