Beta-lactamase

beta

n. 希腊字母表的第二个字母\\n[医] β(希腊文的第二个字母), 乙种

lactamase

n. [生化]内酰胺酶

Sure.

当然。

He who wants a mule without fault,must walk on foot.

指望驴子无缺点，只有自己徒步行。

The only way that they can preserve their history is to recount it as sagas -- legends handed down from one generation of another.These legends are useful because they can tell us something about migrations of people who lived long ago, but none could wri

他们保存历史的唯一办法是将历史当作传说讲述，由讲述人一代接一代地将史实描述为传奇故事口传下来。