They drove home with their windshield wipers going whoosh whoosh.他们驱车回家，一路上挡风玻璃上的雨刮器不停地呼呼刮着。She tore the windscreen wipers from his car.她猛地扯掉他车上的雨刷。The windscreen wipers thudded back and forth.挡风玻璃上的雨刮“啪嗒啪嗒”地来回摆动。...
Most direct substitution of groups bound to an aromatic nucleus is limited to diazonium salts.大多数连于芳核能被直接取代的基团仅限于重氮盐.Severe steric effects at the reactive carbon would impede the substitution.大的立体效应阻止在碳上的取代.We use saccha...