简介:[1] A. J. 赫伯特. 科技英语的结构[M]. 北京,由这些例句不难看出无人称被动句在科技英语中的应用情况,The chain reaction must be carefully controlled.[4](P49)This is done by absorbing excess neutrons in boron control rods.The heat is transferred by circulating carbon dioxide gas.The hot gas is used to produce steam.The whole assembly is called a nuclear reactor.对链式反应必须谨慎控制