英语语法分析

Boko Haram's tactics have changed over time.

博科圣地的策略随着时间不断改变。

Boko Haram gunmen also shot a police inspector.

武装分子还袭击了一名警察巡查员。

But the links have not been proved and little is known about groups such as Boko Haram.

但是，链接关系没有得到证实，并且对博科圣地这类组织有所了解的人甚少。