他膝关节韧带拉伤了。He suffered torn ligaments in his knee.有两名选手膝关节受伤,我们只好不让他们参加比赛.We had to scratch two players from the team because of damaged knee joints.膝关节和踝关节必须加以固定——这通常意味着要打上6个星期的石膏。The knee and ankle joints must be immobi...
缓慢的流速足以防止还原剂的散失.A low rate is enough to prevent flushing of reductants.还原的烟酰胺核苷酸对固态酶可以起还原剂的作用.Reduced nicotinamide nucleotides can function as reductants to nitrogenase.许多金属冶炼操作中需要碳作为还原剂.Carbon is needed as a reducing ag...