He contracted a rare form of cancer...是什么意思？

He contracted a rare form of cancer...

他得了一种罕见的癌症。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

contracted

adj. 收缩了的，已定约的，契约的；

例句
The Boston Museum of Fine Arts has already contracted to lease part of its collection to a museum in Japan.
波士顿美术博物馆已经签订合同，将其部分藏品租借给日本一家博物馆。

rare

adj. 罕见的，特殊的，半熟的；半生的，稀薄的，经过稀化的，三分熟；

例句
It was one of his rare attempts at humour.
那是他极不常见的想要表现幽默的一次。

form

n. 形状，形式，外形，方式，表

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。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

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

cancer

n. 癌症，恶性肿瘤，弊病，社会恶习，迅速蔓延的恶劣的或危险的事物，[天]巨蟹座，巨蟹宫；

例句
An increasing body of evidence suggests that all of us have cancer cells in our bodies at times during our lives.
越来越多的证据表明，我们所有人一生中体内时有癌细胞存在。