The hostage had been shackled to a radiator.是什么意思？

The hostage had been shackled to a radiator.

当时人质被铐在暖气片上。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

hostage

n. 人质，抵押品；

例句
He rebuked the President for trying to make political capital out of the hostage situation.
他谴责总统试图利用人质事件捞取政治利益。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

been

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去分词 ），在，存在，不受干扰，去过了，be的过去分词；

例句
Have you been able to have any kind of contact?...
你联系上了吗？

shackled

v. 给（某人）带上手铐或脚镣( shackle的过去式和过去分词 )；

例句
The trade unions are shackled by the law.
工会受法律的制约。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

radiator

n. 暖气片，散热器，（汽车引擎的）冷却器，辐射体，冰箱；

例句
A household radiator absorbs energy in the form of electric current and releases it in the form of heat.
家用取暖器吸收电流能量，再以热量的形式释放出来。