例句：Track and field sports have dual features of competition and body building.
田径运动具有竞技性和健身性双重属性。

2.open fire 开火

例句：They don't hesitate to open fire when confronted by police.
他们遭遇警察时毫不犹豫地开火。

3.return to 回到

例句：When will you return to the office?
你什么时候回办公室?

4.hand over 移交

例句：When you vacate the room, you should hand over the door key to me.
你搬出房间时，要把房间钥匙交给我。