Both Three Mile Island and Chernobyl were flukes.是什么意思？

Both Three Mile Island and Chernobyl were flukes.

三里岛和切尔诺贝利的事件都是意外事件.

both

adj. 二者，两者都；pron. 二者；adv. 二者，二者都；conj. 不仅…而且…，…和…都；

例句
The gym can be used by both able-bodied and disabled people.
这家健身房健全和残障人士都可使用。

three

num. 三，三个，第三（章，页等）；n. 三岁，三个人[东西]，三，三个；adj. 三的，三个的；

例句
Outsiders who wed islanders are given only three years' right of abode at first.
岛外的人和岛民结婚之初只能获得三年的居住权。

mile

n. 英里，很远的距离，一英里赛跑；

例句
Oil has come ashore on a ten mile stretch to the east of Plymouth...
绵延10英里的浮油已经到达了普利茅斯东岸。

island

n. 岛，岛屿；vt. 使孤立；

例句
Phillimore Island is named after Sir Robert Phillimore...
菲利莫尔岛以罗伯特·菲利莫尔爵士的名字命名。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

Chernobyl

切尔诺贝利（乌克兰北部城市）；

例句
...the Chernobyl disaster, which irradiated large parts of Europe.
使欧洲大片地区受到严重核辐射的切尔诺贝利灾难

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

flukes

n. 侥幸( fluke的名词复数 )，锚爪，（鱼叉等的）倒钩，比目

例句
Schistosomiasis ( or bilharziasis ): Group of chronic disorders caused by parasitic flatworms of the genus Schistosoma ( blood flukes ) .
血吸虫 病: 由 血吸虫 属寄生的扁虫引起的慢性疾病.