五十年代

In the 1850s Samuel M. Kier, a manufacturer inwesternPennsylvania, began collecting the oil from local seepagesandrefining it into kerosene.

在十九世纪五十年代，萨缪尔·M·科尔，宾西法尼亚西部的一位制造商，开始从当地的溢出物中收集石油并将它炼成煤油。

Kier, a manufacturer in western Pennsylvania, began

在十九世纪五十年代，萨缪尔·M·科尔，宾西法尼亚西部的一位制造商，开始从当地的溢出物中收集石油

It is, in fact, David Livingstone, reflecting on his experiences in Africa in the 1850s.

事实上，这是戴维·利文斯通回忆他十九世纪五十年代在非洲探险经历而说的。

John's Hill, which was the madhouse. No really, that's how it was in the 1950s.

当然那不是真的，那是二十世纪五十年代的事。

Rock climbing is a kind of sports derived from mountaineering which originated in Europe in 50's 21 century .

攀岩是以登山活动中派生出来的一项运动，起源于二十世纪五十年代的欧洲。

By the 1850s, landscape architects such as Andrew Jackson Downing and Frederick Law Olmsted were urging the benefits of bringing the country to the city by means of large parks.

十九世纪五十年代，城市设计师如Andrew Jackson Downing和Frederick Law Olmsted强烈要求通过在城市中保有大面积的公园来把乡村带入城市中。

Compounds of quinoxaline di-N-oxides, which were the pre ones having anti-bacteria anti-cancer activity, was found in the 50s last century.

所以对绿色的农药、兽药和抗菌药物的研究应该是食品科学研究领域中的重要内容。 1，4-二氮氧化喹喔啉(Quinoxaline di-N-oxides，简称二氮氧化喹喔啉)是二十世纪五十年代发现的具有抗菌活性的先导化合物。

In the early 1950s, RCA introduced a variation on the process called

在二十世纪五十年代早期，RCA开发了一系列的称为

Beijing of China News Service on March 17 report go up oneself since the century builds system of occupational disease report the fifties, chinese inland accumulative total has more than 40010 people to die at professional pneumoconiosis disease.

中新社北京三月十七日电自上世纪五十年代建立职业病报告制度以来，中国内地累计有十四万多人死于职业尘肺病。

In the field of energy planning, we are always required to solve a kind of linear-inequalities problems with large-scale and sparse coefficient matrix.

自二十世纪五十年代的运筹学以及管理科学的兴起和发展以来，解决线性不等式组的方法层出不穷。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。