Backward shift operator

backward ['bækwɚd]

adj. 向后的;反向的;怯生生的;落后的; adv. 向后地;相反地;回溯地;

back后边+ward向... →向后的

shift [ʃɪft]

vt.& vi. 改变;去掉;摆脱掉;换挡; vt. 换…的衣服，更（衣）;卖，出售;[计算机]使（数据）位移; vi. （汽车）换挡;换衣服;蒙混;自己谋生; n. 移动，转移，转换;变迁，变化，变换，替换，更换，掉换，更易，代用;（汽车等的）变速;

operator ['ɑpəretɚ]

n. 经营者;操作员;电话接线员;运算符;

oper 工作 + ator表示做...工作的人或物 → n.操作人员，接线员

Terrific!

好极了！

It's cloudy this afternoon.

今天下午云很多。

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。