Operational key

operational ['ɑpə'reʃənl]

adj. 即可使用的;（用于）操作的;经营的;军事行动的;

oper 工作 + ation表名词+ al...的 → 操作上的；可使用的

key [kiː]

n. 钥匙;（打字机等的）键;关键，线索，秘诀;（音乐的）调; vt. 键入;锁上;调节…的音调;提供线索; vi. 使用钥匙; adj. 关键的;主要的;

and seeing the wonder of humanity.

看众生奇景。

In university, students are trained to become lawyers and dentists.

大学的学生被训练成为律师和牙医。

The only way that they can preserve their history is to recount it as sagas -- legends handed down from one generation of another.These legends are useful because they can tell us something about migrations of people who lived long ago, but none could wri

他们保存历史的唯一办法是将历史当作传说讲述，由讲述人一代接一代地将史实描述为传奇故事口传下来。