Antibiotic resistance has now become a costly and dangerous problem.
抗生素抗药性不仅代价高昂，也非常危险。
Now environmental pollution has become a very serious problem the world is facing today.
现在环境污染已经成为当今世界面临的一个非常严重的问题。
Now the Prius has a huge problem.
现在，普锐斯面临巨大的问题。
Now, energy issue has become a global problem.
能源问题已经成为了全球问题。
Vidic has had a calf problem for a few weeks now.
维迪奇有伤已经好几周了。
Periodontal tissue regeneration has been a common and complicated clinical problem now.
牙周组织再生已经成为一个共同且复杂的临床难题。
Periodontal tissue regeneration has been a common and complicated clinical problem now.
牙周组织再生已经成为一个共同且复杂的临床难题。
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