Researchers have revealed that the culture lasted mainly from 4300 B.C. to 2500 B.C.

The construction of the tomb started in 247 B.C., and it took 36 years to complete.

这座陵墓始建于公元前247年，花费了36年时间才完工。

According to relevant researches, the culture was prosperous from 3300 B.C. to 2050 B.C.

根据相关研究，马家窑文化兴盛的时间为公元前3300年到公元前2050年。

It is known that great wall was bulit in the3rd century B.C.

众所周知，长城是在公元前3世纪建成的。

Although no one's quite sure, some believe that the practice dates back to600 B.C.

虽然不能确定，但是据说该活动可以追溯到公元前600年。

We have entered into an electronic information age from the era B.C. ( before computers).

我们也因电脑而进入电子资讯时期。

For example, Xi'an's history can be traced back to the11th century B.C.

例如，西安的历史可以上溯到公元前11世纪。

The discovery of alcoholic fermentationappears to date back to about 7000 B.C. in China.

在中国酒精发酵的发现原理可追溯到大约公元前7000年前。

The body of one statue was found among remains dating from the fifteenth century B.C.

雕像的躯体是在公元前15世纪的历史文物中发现的。

Glue is an invention; it's been around since 4000 B.C.

因为胶是一项伟大的发明，它早在公元前4000年左右就已经出现了。

Why didn't I go back to school in the B.C. ( before children) era?

我为什么没在孩子出生前重返校园？

It began in 5000 B.C. and lasted about 3000 years.

它开始于公元前5000年，历经了大约3000年。

Paper has been found in Chinese tombs dating to the2nd century B.C.

公元前2世纪的中国古墓中就发现了纸。

like one that was the center of a settlement around 250 B.C.

就像是中央这座大约在公元前250年建造的金字塔。

It also has an amazing history. In Babylon around 2,800 B.C., the earliest known soap was made and used

它还有一段令人赞叹的历史。在公元前约2800年的巴比伦，人们已经开始制造和使用已知最早的肥皂。

The tradition, dating back to 300 B.C., was later incorporated into the Christian church.

这一传统可以追溯到公元前300年，后来被融入基督教文化中。

Archimedes flourished in the3rd century B.C.

阿基米德活跃于公元前三世纪；阿基米德是公元前三世纪的人。

“ The Classics on Fish Breeding ”, written by Fan Li of the Warring States Period ( 475 B.C.-221B. C.), was the world's first book on fish breeding. Fan started to breed silver carp in 473B. C., and the book was based on his experience.

中国战国时代范蠡所著《养鱼经》是世界上最早的养鱼文献。范在公元前473年即开始养殖鲤鱼，并写下这本书。

He died in 33 B.C.

他死于公元前33年。

She said, "What's going on?" And this is a therapist who sees therapists, because we have to go to those, because their B.S. meters are good.

她说：“发生了什么事？”这是一个治疗心理医生的心理医生，我们不得不去看这些心理医生，因为他们的废话测量仪很准（知道你什么时候在说真心话）。

However, B.S. Bloom holds the view that the students' difference in their achievements results mainly from three factors, namely, behavior with cognition as premise, emotional premise characteristics, and teaching quality.

而布卢姆研究认为，学生学习成绩的差异主要由三个方面的因素造成，即是认知前提行为、情感前提特性、教学质量。