研究人员指出，这个研究有两个重要的限制。
There are two important limitations to the study, the researchers noted.
有替代药物的研究，指出疼痛发出一个负电荷。
There are studies in alternative medicine that says that pain emits a negative charge.
研究人员指出，有很多事情是他们无法确定的。
The researchers point out that there are many things they cannot be sure about.
美国研究人员指出，经常食用加工肉制品有可能增加患心脏病甚至糖尿病的风险。
Eating processed meat may increase the risk for heart disease and even diabetes, U. S. researchers suggest.
美国研究人员指出，经常食用加工肉制品有可能增加患心脏病甚至糖尿病的风险。
Eating processed meat may increase the risk for heart disease and even diabetes, U. S. researchers suggest.
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