There is a need for more long term studies to determine whether the drug is safe and the effect sustained over longer periods.
她说，尚需一个较长期的研究，以确定这种药物的安全性以及长期影响。
There is a need for more long term studies to determine whether the drug is safe and the effect sustained over longer periods.
她说，尚需一个较长期的研究，以确定这种药物的安全性以及长期影响。
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