To you, the world remains an impenetrable mystery, whereas to me it is an open book.
对你而言，世界是一个捉摸不透的谜团，然而对我来讲，却是一目了然。
The ageing process is a complex one, and for long remained an impenetrable mystery, but progress is now being made.
老化过程是一个复杂的，长期仍然是一个令人费解之谜，但目前正在取得进展。
The ageing process is a complex one, and for long remained an impenetrable mystery, but progress is now being made.
老化过程是一个复杂的，长期仍然是一个令人费解之谜，但目前正在取得进展。
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