Our sovereignty over the islands in the South China Sea is based on discovery, preoccupation as well as long-term, sustained and effective management.
我们对南海诸岛的主权是建立在发现、先占和长期、持续、有效管理的基础之上。
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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