Wearing surface on orthotropic steel bridge deck is a complicated yet still not well solved technical problem.
正交异性钢桥面铺装技术一直是困扰道路工程界与学术界的难题之一，至今尚未得到妥善解决。
The text categorization has become a hot research subject which has attracted a lot of attention but still not solved well.
文本分类成为众所关注但仍未很好解决的热门课题。
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