China was the first country in the world to synthesize crystalline insulin, a bioactive protein.中国在世界上最早用人工方法合成一种有生物活力的蛋白质--结晶胰岛素.Microorganisms can produce many beneficial bioactive substances through secondary metaboli...
For most practical cases ergodicity cannot be experimently determined.对最实际的一些情况,各态经历性不可能由实验来决定.They wanted to design a machine that was both attractive and practical.他们想设计一种既美观又实用的机械。How could she be so practical when he...