他们用沉重的链条把船固定在码头上。

They ___anchored the boat to the dock with heavy chains.

记者对那次事件的记忆被一张照片固定在特定的时间和地点。

The journalist's memory of the event was ___anchored in time and place by a single photograph.

请用夹子把这些文件固定在布告板上，以免被风吹走。

Please ___anchor these documents to the bulletin board with clips so they don't blow away.