However, because many complementary and alternative therapies have not yet been studied, it is not known which are potentially helpful, and which are potentially harmful.
然而，由于很多辅助疗法，选择疗法还没有被研究过，那些方法是潜在有效的，哪些是潜在有害的，还不清楚。
However, because many complementary and alternative therapies have not yet been studied, it is not known which are potentially helpful, and which are potentially harmful.
然而，由于很多辅助疗法，选择疗法还没有被研究过，那些方法是潜在有效的，哪些是潜在有害的，还不清楚。
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