问几个初中英语问题1.thousands of ,thousands and thousands of哪个是[成千上万]

1。thousands of 是“成千上万” 数以千计应该是hundreds of 吧。。因为第二个很不常见 2。be famous for 是由于某件事物而闻名,如：China is famous for the Grate Wall。be famous as是以**身份而出名,一般加以职业：Jay is famous as a singer。be known as被认为是。be known for后跟某样具体事物 “著名” 和“ 所知” 是不一样的 具体要自己理解