地球外存在生命的理论是基于陨星上存在碳化合物质这一事实的.One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites.据说这枚陨星是在热分解的化学过程中形成的。It is said that the magnetite was formed by a chemical pro...
I hung there, scrabbling with my feet to find a foothold.我吊在那儿，两脚乱蹬着寻找落脚点。The company is eager to gain a foothold in Europe.这家公司急于在欧洲取得一席之地。That is a secure foothold.那是一可靠的落脚点....
原始的碳纤维材料很像布料。In its untreated state the carbon fibre material is rather like cloth.我曾在世界上最荒凉、最原始的地区工作过。I have worked in the wildest and most uncivilized parts of the world.那个部落处于比邻近部落更原始的发展阶段.The tribe's development...