Europe's biggest Stone Age earthworks are at Silbury Hill in Wiltshire.欧洲石器时期最大的土木防御工事位于威尔特郡的西尔布利山。Stone Age settlers fashioned necklaces from sheep'steeth.石器时代的移居者用羊的牙做成项链。He discovered a Stone Age village 5,0...
外毒素对几乎所有生命形式包括人有毒. 具有 广谱 杀虫活性.It is toxic to almost all forms of life including humans. It has broad - spectrum insecticidal activity.外毒素是RNA聚合酶的抑制剂,在各个生化过程中与ATP起竞争作用.Beta - exotoxin is an inhibitor of RNA polymerase and...
农民用脱粒机脱粒.Farmers thresh grain with threshing machines.他和他的堂兄弟们合伙买了一台蒸气脱粒机.He and his cousins bought a steam thresher on shares.脱粒机现在由电驱动.Now electricity runs the thresher....