To explain this, they hypothesise that galaxies must contain a great deal of missing matter which cannot be detected. 为了解释这一点，他们假定各星系一定包含了大量无法探测到的不明物质。
He introduced radio to the school to increase the children's awareness.他在学校开通广播，以提高孩子们的警觉性。In 1971, the 1p and 2p decimal coins were introduced in Britain.英国于1971年开始使用十进制的1便士和2便士硬币。She showed me round and introduced...
Doran was clutching the bottle with both hands and sucking intently.多兰双手紧紧抓着瓶子尽情地喝着。He listened intently, then slammed down the phone.他专心地听着，然后砰地挂上电话。His eyes blazed intently into mine.他凝视着我的眼睛。...
They suspected that Neville had traded secret information with Mr Foster.他们怀疑内维尔和福斯特先生交换了秘密情报。Its shares are traded on the Unlisted Securities Market.那家公司的股票在场外证券市场交易。He was traded from the Giants to the Yankees.他从巨人队转会到...