The management of context in natural language understanding can present special challenges.

This move comes close, with a special challenge for the core.

Long Island must be a special challenge for map makers.

It's a special challenge involving sometimes very different short and long-term goals.

But he said that this epidemic presented a special challenge.

But perhaps media companies pose a special challenge to the outsider.

His records suggested a dangerous man, but not any special challenge to the justice system.

Men can face special challenges when we develop a disease more common in women.

A program of 20th-century music represents no special challenge for these players.

Growing numbers of elderly among minority groups present special challenges for the city in the future.