While much work remains, trends in recent years indicate the PLA is beginning to operationalize its modern force, taking on new and more challenging missions.
尽管还有很多工作要做，但近年来的趋势表明，解放军正开始将其现代化部队投入运营，承担新的、更具挑战性的任务。
The case of the lone Indian represents its most challenging test.
这个孤独印第安人的实例则是这项政策最有挑战性的尝试。
Pink Floyd was originally a "psychedelic" band with typical nonsense lyrics and themes, becoming only gradually a band known for its deep and challenging concept albums.
平克·弗洛伊德从最初的仅有典型的无意义的歌词与主题的“迷幻”乐队，逐渐成长为一个其专辑具有深刻意义并富有挑战性的乐队。
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