For teachers, it can be particularly challenging to get students back on track.

For supporters of the president, the last few weeks have been particularly challenging.

The situation is particularly challenging for football teams, which have only one game a week during the season.

The site proved to be particularly challenging to clean up without disturbing the area.

The transition from one stage to another may be particularly challenging for governance.

It will be particularly challenging to detect such damage during a flight, he said.

Those tasks will be particularly challenging over the next two weeks, some Republican strategists said.

This group of offenders are particularly challenging due to language barriers and cultural differences.

Moreover, many argue that changing social norms have been particularly challenging for men.

"The last several months were particularly challenging for Apple and for our industry," he said.