三期试验：这些试验研究一个新药，一个新的药物合用或者一个新的手术方法与当前标准治疗的比较。
Phase III trials: These studies test a new drug, a new combination of drugs, or a new surgical procedure in comparison to the current standard.
研究人员仅仅发现攻击性的牙科手术治疗可能导致细菌进入血管或引发炎症。
The researchers only looked at invasive dental surgery—procedures likely to allow bacteria to enter the bloodstream or cause inflammation.
有专家说，这项研究结果可能会改变对早期乳癌扩散至淋巴结的手术治疗方式。
Some experts say the study is likely to change the way surgeons treat early-stage breast cancers that have spread to the lymph nodes.
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