sharks have been around for a very long time.这句话中为什么有around?

sharks have been around for a very long time.这句话中为什么有around? sharks are amazing fish that have been around since long before the dinosaurs existed翻译并分析句子结构 Many people believe sharks are dangerous and always try to hurt or even kill humans.In fact,941.which of the following is the aim of the writer?A.sharks actually always hurt or even kill people.B.sharks have been around for about 400 million years.C. Aro是什么意思 ArO-是什么? 这里面as 是作为什么词性 怎么直接跟着动词ing了呢There are nearly 400 different types of sharks,but only about 30 types have ever been reported as attacking humans. 有没有many thousand,several thousand,和several thousands of2 Sharks have been on earthfor many _____ years.A thousand B thousands C thousands of D thousanded of选什么为什么 have been have been have been have been the number of kinds of sharks have为什么用have是因为kinds of 英语翻译Hell of a damn trip.Already have 7 sharks circling my house. there are different kinds of sharks which have 30 families 翻译 Sharks in Australia have not killed nearly as many people as sea wasps.如何翻译较好 aro是英文单词吗 have been还是have been being? have since been 和 have been since