Negative adverbs in Chinese dialects are rather complex, a number of problems still need further study.
汉语方言中否定副词相当复杂，不少问题尚需进一步深入研究。
At present, melt purityproperty relationships as well as online evaluation standards of melt purity still need further study.
目前熔体洁净度-性能关系的研究以及与相应的熔体洁净度在线评定标准还有待深入探讨。
The mechanisms are still not well understood and need further study.
这些反应的具体机制还有待进一步深入研究。
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