But new research is showing that nicotine adds further, more insidious risks.
But new research is showing that nicotine adds further, more insidious risks.
但新的实验表明，尼古丁会使危险变本加厉。
But new research is showing that nicotine adds further, more insidious risks.
但新的实验表明，尼古丁会使危险变本加厉。