Billy leaned forward and brushed a speck of dust off his shoes.比利俯身擦掉了鞋子上的一丝灰尘。I've got a speck of dirt on my shirt.我的衬衫上有一点污垢.Not a speck of cloud is to be seen.看不到一星星云丝....
A 15-year lifespan is not uncommon for a dog.15年的寿命对狗而言是比较常见的。Most boilers have a lifespan of 15 to 20 years.绝大多数锅炉有15至20年的使用期限。Worms have a lifespan of a few months.蠕虫的寿命为几个月。...
结果羟苯乙酯在荧光素钠滴眼剂中的防腐良好.Result Ethylparaben is a good antiseptic in fluorescein sodium eyedrop.异硫氰酸荧光素 ( FITC ) 是一种重要的荧光探针.Fluorescein isothiocyanate ( FITC ) is an important fluorescence probe.目的: 制备荧光素钠滴眼液并建立其质量控制方法.OBJEC...
据说这枚陨星是在热分解的化学过程中形成的。It is said that the magnetite was formed by a chemical process called thermal decomposition.采用Mn时,光引发和光分解的量子产率也很低.Quantum yields for photoinitiation and photodecomposition are also low with Mn.有机物分解的...