2. The risks, he said, were rubbish, unproven by science, while the potential benefits were endless. 他说,未经科学证实的风险不过是垃圾,而潜在的优势则永无止境。
3. The utility of impedance monitoring in refractory reflux patients with primary complaints of chest pain or extraesophageal symptoms is unproven. 在最初抱怨胸痛或者食管外症状的难治反流病人,阻抗检测有效性未得到证实。