不幸的是，至今我们仍无特效药。
专家们尝试建立治疗痴呆方案，却很失望的发现治疗痴呆无特效药，也没有办法决定哪种药治疗痴呆最好。
Experts who tried to set up treatment guidelines were disappointed to find no good options for patients with dementia, and no way to determine which drug might be best for certain cases.
近年来，由于大豆连作普遍、土壤耕作次数减少且无防除苣荬菜的特效药，导致大豆田苣荬菜的危害日趋严重。
During recent years, continuous cropping Soybean, lack of soil tillage and lack of effective herbicide for Perennial sowthistle caused Perennial sowthistle rampant.
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