n. 齿状山脊,马鲛
网络 塞拉; 雪乐山; 西拉
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。
Europeans did not know of them until the 1500s, when Portuguese ships arrived on the coast of what is now Sierra Leone.
直到16世纪,当葡萄牙的船只抵达现在的塞拉利昂海岸时,欧洲人才知道它们的存在。
In 1869, John went to the Sierra Nevada Mountains.
1869年,约翰去了内华达山脉。
When did John go to climb the Sierra Nevadan Mountains?
约翰是什么时候去爬内华达山脉的?