In some parts of the country Koalas are nearly extinct.在澳大利亚的一些地区,考拉几乎灭绝.And there are many koalas and kangaroos in Australia.澳大利亚还有很多考拉和袋鼠.What's your favourite animal? I like koalas the most.你最喜欢什么动物? 我最喜欢的是考拉....
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...