The river rises in the Sierra Nevada.

这条河流发源于内华达山脉。

The small village is surrounded by sierras.

小村庄被层峦叠嶂的山脉围绕。

There are several sierras on this telegram.

这封电报上有几个表示字母S的代码字。

A sierra is a range of mountains with jagged peaks.

锯齿状山岭是呈锯齿状 层峦叠嶂的山脉

In Sierra Leone, English is used as the medium of instruction for all primary education.

在塞拉利昂，所有基础教育都用英语授课。

Amanda Pease is one of almost forty volunteers serving in rural schools in Sierra Leone.

阿曼达·皮斯是在塞拉利昂乡村学校服务的近40名志愿者之一。

No area was spared or unaffected, from the foggy northern coast to the Sierra Nevada Mountains.

从雾蒙蒙的北部海岸到内华达山脉，没有一个地区幸免或不受影响。

Sierra Leone is desperately poor.

塞拉利昂是一个十分贫穷的国家。

In Sierra Leone it is exactly that.

而在塞拉利昂，情况正是如此。