他们生产优质刀片已经有400年历史了。They have been turning out great blades for 400 years.这些工具中很多都有锋利的刀片，务必小心。Many of these tools have sharp blades, so be careful.他用一次性刀片刮脸。He shaved himself with a disposable razor....
他粗暴的外表下藏着一颗非常善良的心。His gruff exterior concealed one of the kindest hearts.他们或许会感到疲惫，虽然外表看似没事，但可能很容易发火。They may feel tired and though outwardly calm, can be irritable.性格和外表是分不开的，而且观其形知其性。Character is not separable from phy...
在原子物理学的术语中, “ 壳层 ” 一词是经常使用的.The word'shell " is used extensively in the terminology of atomic physics.所有的碱金属都在闭合壳层之外有一单个S电子.All the alkali metals have a single s - electron outside a closed shell.原子核形变证实壳层结构.Nuclear...