By 8,200 B.C., drought conditions were so severe that the people abandoned their long-established settlement, perhaps dispersing into smaller camps.(公元前8200年的时候，旱情十分严重，这使得人们放弃了居住已久的定居点，并可能散居到更小的营地中去了。)
Prior to 200 B.C., a number of relatively small centers coexisted in and near the Valley of Mexico.(在公元前200年以前，在墨西哥峡谷内部及周边有很多相对较小的城镇中心共存着。)
The tradition, dating back to 300 B.C., was later incorporated into the Christian church.(这个传统可以追溯到公元前300年，后来被并入基督教会。)
The cleansing of the temple in 164 B.C. is what Jews celebrate with Hanukkah.(犹太人的光明节是为了庆祝公元前164年圣殿的净化。)
The classic Greek tragedies of the fifth century B.C. were primarily celebrations of gods.(公元前5世纪的经典希腊悲剧主要是记录对神的庆祝。)
He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.(他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。)
Long-handed Neolithic spoons of yew wood preserved in Alpine villages dating to 3000 B.C. have survived.(保存在阿尔卑斯山一带的村庄中的新石器时代的长柄紫杉木质勺子一直留存到现在，其历史可以追溯到公元前3000年。)
For example, Aristotle once had a research library in the third century B.C..(例如，亚里斯多德在公元前三世纪曾有一个研究型图书馆。)
There were no aircraft in 300 B.C., when it is judged the designs were made.(公元前300年还没有飞机，人们判断那时候飞机的设计就已经完成了。)
