Impulse period

impulse ['ɪmpʌls]

n. 凭冲动行事;突如其来的念头;[电子]脉冲;[医]冲动，搏动; adj. 冲动的; v. 推动;

im向内，进入+pulse跳动→冲动

period ['pɪrɪəd]

n. 时期;（一段）时间;学时;句号; adj. 具有某个时代特征的;（关于）过去某一特定历史时期的;（家具、服饰、建筑等）某一时代的;

peri周围，靠近+od道路→周期

I'm your mother.

我是你母亲。

When will you be released?

你预定何时出院？

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。