The first catalytic converters were called conventional oxidation catalysts.最初的转化器叫做常规氧化催化器.Many processes that are essential to the chemical industry use heterogeneous catalysts.很多重要的化学工业过程就是使用多相催化剂的.The producing techn...
对珍妮特来说，这一切听起来熟悉得叫人丧气。It all sounded depressingly familiar to Janet.嘉莉又疲倦又丧气, 不过现在她可以休息了.Carrie was tired and dispirited, but now she could rest.这人很年青,贼眉鼠眼,满脸丧气.He was a young man with furtive eyes and a sullen look....