although difficulties remain
尽管困难依然存在
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Although great progress has been achieved recently in this field, many difficulties and problems still remain unresolved. Countermeasures and prospects were put forward in this article.
尽管近年来中西医结合防治冠心病研究取得了较大进展，但仍存在许多问题和难点，本文就此提出对策及展望。
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