将“convertible"翻译成中文

I was going down the tunnel in a convertible car, old convertible car.

我 快要 落山 隧道 在 敞篷车 , 老 敞篷车 。

Alone among the world’s great nations, the US did manage to guarantee dollar convertibility throughout the Great War.

在一战期间,美国是列强中唯一一个能保证其货币和黄金之间自由兑换的国家。