她说目前确认化学成分是否造成癌症的途径每次对其进行试验。
She says the current way to identify whether chemicals cause cancer is to test them one at a time.
这类饮料尚未经过严格临床试验的检测，不过有研究显示，其中至少有些成分能帮助睡眠或缓解焦虑。
The drinks have not been tested in rigorous clinicaltrials, but at least some of their ingredients have been shown in studies to aid sleep or reduce anxiety.
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