He is trying his best to break the record.他正在尽最大努力去打破记录.He did very well, but failed to break the record.他做得很出色, 但未破记录.He did very well, but he failed to break the record.他干得很好, 可是没能打破纪录....
目的:评价异 丁基 壳聚糖作为生物材料的安全性.Objective To evaluate the bio compatibility of isobutyl - chitosan as a material.使用二异丁基-二甲氧基硅烷, DQ催化剂的氢调敏感性更好.With di - iso - butyl dimethoxy DIBS, DQ catalyst was more sensitive to hydrogen regul...