Sentence examples for this are challenges from inspiring English sources

Underpinning all this are challenges of funding.

This was challenging.

When this is challenged, they feel threatened.

ESA knows this is challenging.

This was challenged by Ms McKennitt.

"This is challenging democracy after the elections".

This was challenging, chest-thumping talk.

At first, this was challenging for me.

For many scientists, this is challenging.

In green open access this is challenging".

This is challenging to me.