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This discovery pushes it back tens of thousands of years into Africa—and suggests that the southern African coast may have been the site of a truly Promethean revolution.

该研究发现认为这种技术起源于非洲，而且向后推了几万年。同时这项研究表明，南部非洲沿海地区可能是人类真正的普罗米修斯式的革命发源地。

Tens of thousands of people gathered in the square to protest against the war.

成千上万的人民聚集在广场上抗议这场战争。

Every day has the tens of thousands of international purchases to find their product in this.

每天都有成千上万的国际采购在此找到他们的产品。

If purificatory measure does not be taken, the content of HCl gas in the air will arrive at several tens or hundreds mg/m~3 more.

在化工、造纸、电镀、油脂等行业中不可避免地要产生氯化氢废气，如不采取净化措施，会使车间空气中氯化氢废气的浓度达到数十甚至数百mg/m~3 ，远高于环境卫生标准0.3 mg/m~3。

Pyroxenite or anortlesite partings a fraction of an inch to 2 feet in thickness and tens of feet to hundreds of feet in length are also present in many seams.

在许多矿层中还见到辉岩或斜长岩夹层，厚几分至2尺，长几十到几百尺。

But the tens of billions of scale, real estate enterprises are faced with a qualitative change.

但百亿规模，房地产企业面对的是一个质的变化。

When I first bought this way, because the radiation protection apron spread widely, from tens of thousands have.

我当初就是这样买的，因为防辐射的围裙差价很大，从上千到几十的都有。

The United States dropped single bombs on the two Japanese cities in August 1945, killing tens of thousands immediately and many more later from radiation sickness.

美国在1945年的8月在日本的两个城市分别投下了一个炸弹，顷刻之间杀死了成千上万的人，并且有更多的人死于核辐射带来的疾病

6 Tens of millions of dollars invested in these projects, the company introduced foreign advanced production equipment ramie.

一期工程投资6千万元，公司引进国外先进的苎麻生产设备。

The ECM productivity of inner ratchet wheel is very high. Cathode piece is machined easily using WEDM. Its dimension is nicety. Cathode is not worn down in process,so a piece of cathode can be repeat used to machining tens or several hundred parts. The surface quality of inner ratchet wheel being machined is nice. There is no burr in the surface. Its surface roughness can reach Ra1.6μm.Its ...

应用电化学加工技术加工内棘轮，生产率很高；采用线切割加工片状工具阴极，制作方便、尺寸准确；加工过程中工具阴极无损耗，一片阴极可以重复加工几十至几百个零件；加工出的内棘轮表面质量好，无飞边毛刺，表面粗糙度可达Ra1.6 μm ；加工精度较高。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。