1. We need a more vigorous international effort to address this issue in border regions.

2. It has also produced vigorous debate about the nature of intelligence itself.

3. The comments set off vigorous discussion on social media in Iran, where soccer is the most popular sport.

4. Google began its vigorous defense by calling attention to the success of its competition and denying the charges.

5. Public sector unions are important to examine because they have a major influence on government policies through their vigorous lobbying efforts.

6. But observers say Mr Bo has given what, for China, is an unusually vigorous defence.

7. He waged a vigorous campaign to defeat the deal, arguing that it was too lenient toward the guerrillas.