He took a great many photographs but then he ran into difficulies.这句里不能加then。其余的差不多吧，是新概念里面的一段。
请帮我一下各位大哥哥,大姐姐.我的这段英语对吗?In 1929,the American explorer ,R.E.B
He took a great many photographs but then he ran into difficulies.这句里不能加then。其余的差不多吧，是新概念里面的一段。