Sentence examples for Main challenge from inspiring English sources

The main challenge is pollution.

"The main challenge is economical viability".

The main challenge is communication.

The main challenge is making them watertight.

That has been the main challenge.

What has been the main challenge?

"Reproducibility was the main challenge," he says.

The main challenge is the condensation risk.

The main challenge to the old order is Podemos.

But improving the quality of care remains the main challenge.

His main challenge is getting other unions to join in.