随着国歌响起，士兵们缓缓展开国旗。

As the national anthem plays, the soldiers slowly ___unfurl the flag.

随着调查的深入，真相逐渐展开。

The truth ___unfurls gradually as the investigation progresses.

船长展开旗帜，宣布船只正式抵达港口。

The captain ___unfurls the flag to announce the ship's official arrival at the port.