The police locked arms to form a barrier against the protesters.

【lock，lockable】警察臂挽着臂组成一道人墙，阻挡抗议者。

In central Kiev, fires continued to burn around the Independence Square with anti-government protesters and the riot police locked in tense standoff.

在基辅中心，独立广场周围仍在燃烧大火，反政府抗议者和防暴警察仍在僵持中。