骑自行车是一项不错的锻炼方式。它能使身体各部分的肌肉更强健。Cycling is good exercise. It strengthens all the muscles of the body.统一体总要分解为不同部分的.A unity invariably tends to break up into different parts.构成那部小说开头部分的几章特别好.The chapters that comprise the f...
N acetylcysteine ( NAC ), a precursor of glutathione, is a thiol antioxidant.N-乙酰半胱氨酸 ( NAC ) 为谷胱甘肽的前体, 是一种含有巯基的抗氧化剂.Error is often the precursor of what is correct,but conceit is the prelude to a fall.错误往往是正确的先导,骄傲是跌跤的前...