纤维腺瘤和PT的鉴别诊断以及PT的组织学分级仍然具有挑战性。
The differential diagnosis between PT and fibroadenoma and the histologic grading of PT remain challenging.
然而在这种例子中接下来的事情仍然很具有挑战性，LouisMarino医生说，普罗维登斯巴特勒医院的高级治疗项目主任。
Yet follow-up can still be a challenge in those cases, said Dr.Louis Marino, chief of the Senior Treatment Program at Butler Hospital, in Providence.
然而在这种例子中接下来的事情仍然很具有挑战性，LouisMarino医生说，普罗维登斯·巴特勒医院的高级治疗项目主任。
Yet follow-up can still be a challenge in those cases, said Dr. Louis Marino, chief of the Senior Treatment Program at Butler Hospital, in Providence.
选择物理可能是因为我发现这门功课最难、最具有挑战性。直到现在我仍然这样认为。
The choice of physics was probably based on the fact that I found it the most difficult and challenging subject, and I still do to this day.
但是持续地战斗在有争议的地区，帮助叛军，这仍然是一个具有挑战性并且复杂的目标。
But with continued ground fighting in contested areas, helping the rebels remains a challenging and complicated goal.
请给出一个你面对非常具有挑战性的目标，但是仍然通过个人的努力最终达成目标的例子。
Give me a case that you got a very challenging target and you finally achieved the target through your hard work.
但是叶轮机械，尤其是跨音速轴流压气机叶片的气动优化设计仍然是一个具有挑战性的研究领域。
But the aerodynamic optimization of the turbomachinery blade, especially the transonic compressor blade, is still a challenge area.
信任模型是信任机制的基础，由于信任本身的复杂性，构建高效、高精度的信任模型仍然是一个具有挑战性也非常有意义的课题。
Trust model is the basis of trust mechanism. Due to the complexity of the trust itself, building efficient, high-precision trust model is still a challenging and very significant issue.
信任模型是信任机制的基础，由于信任本身的复杂性，构建高效、高精度的信任模型仍然是一个具有挑战性也非常有意义的课题。
Trust model is the basis of trust mechanism. Due to the complexity of the trust itself, building efficient, high-precision trust model is still a challenging and very significant issue.
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