I know a little Russian, but this is a sealed book to me.
我懂一点俄语，但这种语言对我来说如天书一般难懂。
The young generation was always something of a sealed book to Mr Smith.
史密斯先生始终无法了解年轻的一代。
The origin of the universe is still a sealed book to us.
宇宙的起源对我们来说仍然是不可知的。
The origin of the universe is still a sealed book to us.
宇宙的起源对我们来说仍然是不可知的。
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