It could be exhilarating, intimidating, sometimes even discouraging, but always challenging.
哈佛的生活使人兴奋，让人胆怯，有时甚至会感到泄气，但永远充满了挑战。
What I remember above all about Harvard was being in the midst of so much energy and intelligence. It could be exhilarating, intimidating, sometimes even discouraging, but always challenging.
我所记忆的哈佛一切是我活力和智力的中坚，令人或振奋，或可怕，或沮丧，但具挑战性，独具殊荣。
You will find this book sometimes challenging, sometimes startling, but always fascinating.
你可能会发现本书具有挑战性，有时又会使你大吃一惊，但总是你令你意想不到。
But as civil engineering structures are often particular and bulky, and relevant damage can be local and mild, damage detection within civil structures is always both difficult and challenging.
但由于土木工程结构个性化强、体积大，其损伤具有局部和微小等特点，导致土木工程结构的损伤识别更为困难、也更具挑战性。
But few managers have only interesting, challenging work to distribute: there is always the boring and mundane to be done. This is a management problem for you to solve.
但是通常分配给员工的工作都是枯燥而且平凡无奇，这都是你需要去解决的管理方面的问题。
I have always set myself challenging goals but for some reason the purity of sporting challenges makes the lessons more vivid.
一直以来，我都不断为自己设定富有挑战的目标，但是这一次我只追求挑战运动极限，令这段经历更为鲜活深刻。
I have always set myself challenging goals but for some reason the purity of sporting challenges makes the lessons more vivid.
一直以来，我都不断为自己设定富有挑战的目标，但是这一次我只追求挑战运动极限，令这段经历更为鲜活深刻。
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