我们必须找到从页岩中采油的经济方法.We must find economical methods for extracting oil from shale.我们可以从页岩中提取石油.We can extract oil from shale.这个地区的灰岩 、 砂岩和页岩都是很柔软的.The limestone, sandstone and shale of this area were soft....
它们有哑铜的，古铜的和镀银的。They are available in polished brass, antique brass or silver-plate.要求学生们检验铜的纯度.The students are asked to prove the purity of copper.夹头和电极之间的接触面是银的或铜的.The contact area between clamp and terminal is either ...
He owned several patents.他拥有几项专利发明.He held a number of patents for his many innovations.他拥有多项发明的专利权。Intangible assets include goodwill, patents, trademarks, copyrights, and franchise.无形资产包括商誉 、 专利权 、 商标 、 版权, 以及专营权.The b...
Frequently, dewatering of sludges is difficult, especially when of gelatinous consistency.通常来说, 污泥脱水是困难的, 特别是属于胶粘状稠厚污泥时.This paper fabrication technique of gelatinous confections with dietary fibre without sucrose.主要介绍无蔗...