Nick looked at Bob in sudden startled concentration, then turned to Brian.

The T'kari moved together, touching hands, eyes shut in sudden, intense concentration.

The sudden concentration of national and international business brought, especially to Manhattan, both the demands for new building and the wealth to realize it.

Aleneil caught her brother's look of sudden concentration, and felt both alarmed and pleased.

Elli had her head tilted, frowning, and listening in sudden concentration.

This sudden concentration of the enemy's fire lasted about two minutes.

This sudden concentration of a toxin is an example of a steep gradient.

The old woman's eyes narrowed in sudden concentration.

Stephen tensed, and in his sudden concentration even came close to forgetting for the moment that he was carrying two drawn Swords.

This young man's lawyer actually cited his sudden concentration upon skinning as proof that rape had not occurred.