Sentence examples for A serious challenge from inspiring English sources

A serious challenge lies in fully characterizing the MHC and pathogen load.

A serious challenge is the high running cost of an NGS study.

The board has a serious challenge.

Eazel faces a serious challenge.

He has never faced a serious challenge.

But a serious challenge to Boehner's leadership failed to materialize.

Ms. Soli thus creates a serious challenge for her narrative.

He led from start to finish without a serious challenge.

Balls-in-play average poses a serious challenge for forecasters.

He has never had a serious challenge since.

Getting that door up here was a serious challenge.