They felt frustrated at the lack of progress.
没有进展，他们感到懊丧。
I personally find this lack of progress outrageous.
我个人认为，这一缺乏进展的局面令人难以容忍。
I was frustrated with the lack of progress.
由于进展缓慢，我感到很沮丧。
Economist attributed the lack of progress to poor cooperation.
经济学家把缺乏进步归咎于合作不好。
Economists attributed the lack of progress to poor cooperation.
经济学家把缺乏进步归咎于合作不好。
Too often we are hard on ourselves and feel bad about our lack of progress.
我们常常对自己很刻薄，为自己没有进步而难过。
Both sides in the dispute appeared very frustrated at the lack of progress.
争执双方因事情毫无进展而显得十分沮丧。
Both sides in the dispute appeared very frustrated at the lack of progress.
争执双方因事情毫无进展而显得十分沮丧。
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