1、I know a little Russian, but this is a sealed book to me.
我懂一點俄語，但這種語言對我來說如天書一般難懂。

2、The young generation was always something of a sealed book to Mr Smith.
史密斯先生始終無法了解年輕的一代。

3、Fifteenth-century art was a sealed book to him.
他對15世紀的藝術一無所知。

4、The origin of the universe is still a sealed book to us.
宇宙的起源對我們來說仍然是不可知的。

5、I know a little Russian, but this is a sealed book to me
我懂一點俄語，但這種語言對我來說如天書一般難懂。

6、Fifteenth-century art was a sealed book to him
他對15世紀的藝術一無所知。

7、The young generation was always something of a sealed book to Mr Smith
史密斯先生始終無法了解年輕的一代。

a sealed book翻譯